diff --git a/include/swaynagbar/nagbar.h b/include/swaynagbar/nagbar.h
index 07a0d51e..8b55e4fa 100644
--- a/include/swaynagbar/nagbar.h
+++ b/include/swaynagbar/nagbar.h
@@ -7,17 +7,26 @@
 
 #define NAGBAR_BAR_BORDER_THICKNESS 2
 #define NAGBAR_MESSAGE_PADDING 8
+#define NAGBAR_DETAILS_BORDER_THICKNESS 3
 #define NAGBAR_BUTTON_BORDER_THICKNESS 3
 #define NAGBAR_BUTTON_GAP 20
 #define NAGBAR_BUTTON_GAP_CLOSE 15
 #define NAGBAR_BUTTON_MARGIN_RIGHT 2
 #define NAGBAR_BUTTON_PADDING 3
 
+#define NAGBAR_MAX_HEIGHT 500
+
 enum sway_nagbar_type {
 	NAGBAR_ERROR,
 	NAGBAR_WARNING,
 };
 
+enum sway_nagbar_action_type {
+	NAGBAR_ACTION_DISMISS,
+	NAGBAR_ACTION_EXPAND,
+	NAGBAR_ACTION_COMMAND,
+};
+
 struct sway_nagbar_colors {
 	uint32_t button_background;
 	uint32_t background;
@@ -43,6 +52,7 @@ struct sway_nagbar_output {
 
 struct sway_nagbar_button {
 	char *text;
+	enum sway_nagbar_action_type type;
 	char *action;
 	int x;
 	int y;
@@ -50,6 +60,22 @@ struct sway_nagbar_button {
 	int height;
 };
 
+struct sway_nagbar_details {
+	bool visible;
+	char *message;
+
+	int x;
+	int y;
+	int width;
+	int height;
+
+	int offset;
+	int visible_lines;
+	int total_lines;
+	struct sway_nagbar_button button_up;
+	struct sway_nagbar_button button_down;
+};
+
 struct sway_nagbar {
 	bool run_display;
 	int querying_outputs;
@@ -77,6 +103,7 @@ struct sway_nagbar {
 	char *message;
 	char *font;
 	list_t *buttons;
+	struct sway_nagbar_details details;
 };
 
 void nagbar_setup(struct sway_nagbar *nagbar);
diff --git a/swaynagbar/main.c b/swaynagbar/main.c
index f5ed064e..389118c6 100644
--- a/swaynagbar/main.c
+++ b/swaynagbar/main.c
@@ -3,6 +3,7 @@
 #include <signal.h>
 #include "log.h"
 #include "list.h"
+#include "readline.h"
 #include "swaynagbar/nagbar.h"
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
 
@@ -34,6 +35,32 @@ static void set_nagbar_colors() {
 	}
 }
 
+static char *read_from_stdin() {
+	char *buffer = NULL;
+	while (!feof(stdin)) {
+		char *line = read_line(stdin);
+		if (!line) {
+			continue;
+		}
+
+		if (!buffer) {
+			buffer = strdup(line);
+		} else {
+			buffer = realloc(buffer, strlen(buffer) + strlen(line) + 2);
+			strcat(buffer, line);
+			strcat(buffer, "\n");
+		}
+
+		free(line);
+	}
+
+	if (buffer && buffer[strlen(buffer) - 1] == '\n') {
+		buffer[strlen(buffer) - 1] = '\0';
+	}
+
+	return buffer;
+}
+
 int main(int argc, char **argv) {
 	int exit_code = EXIT_SUCCESS;
 	bool debug = false;
@@ -50,17 +77,25 @@ int main(int argc, char **argv) {
 	struct sway_nagbar_button *button_close =
 		calloc(sizeof(struct sway_nagbar_button), 1);
 	button_close->text = strdup("X");
-	button_close->action = NULL;
+	button_close->type = NAGBAR_ACTION_DISMISS;
 	list_add(nagbar.buttons, button_close);
 
-	static struct option long_options[] = {
+	struct sway_nagbar_button *button_details =
+		calloc(sizeof(struct sway_nagbar_button), 1);
+	button_details->text = strdup("Toggle Details");
+	button_details->type = NAGBAR_ACTION_EXPAND;
+
+	static struct option opts[] = {
 		{"button", required_argument, NULL, 'b'},
 		{"debug", no_argument, NULL, 'd'},
 		{"edge", required_argument, NULL, 'e'},
 		{"font", required_argument, NULL, 'f'},
 		{"help", no_argument, NULL, 'h'},
+		{"detailed-message", required_argument, NULL, 'l'},
+		{"detailed-button", required_argument, NULL, 'L'},
 		{"message", required_argument, NULL, 'm'},
 		{"output", required_argument, NULL, 'o'},
+		{"dismiss-button", required_argument, NULL, 's'},
 		{"type", required_argument, NULL, 't'},
 		{"version", no_argument, NULL, 'v'},
 		{0, 0, 0, 0}
@@ -75,26 +110,30 @@ int main(int argc, char **argv) {
 		"  -e, --edge top|bottom         Set the edge to use.\n"
 		"  -f, --font <font>             Set the font to use.\n"
 		"  -h, --help                    Show help message and quit.\n"
+		"  -l, --detailed-message <msg>  Set a detailed message.\n"
+		"  -L, --detailed-button <text>  Set the text of the detail button.\n"
 		"  -m, --message <msg>           Set the message text.\n"
 		"  -o, --output <output>         Set the output to use.\n"
+		"  -s, --dismiss-button <text>   Set the dismiss button text.\n"
 		"  -t, --type error|warning      Set the message type.\n"
 		"  -v, --version                 Show the version number and quit.\n";
 
 	while (1) {
-		int c = getopt_long(argc, argv, "b:de:f:hm:o:t:v", long_options, NULL);
+		int c = getopt_long(argc, argv, "b:de:f:hl:L:m:o:s:t:v", opts, NULL);
 		if (c == -1) {
 			break;
 		}
 		switch (c) {
 		case 'b': // Button
 			if (optind >= argc) {
-				fprintf(stderr, "Missing action for button %s", optarg);
+				fprintf(stderr, "Missing action for button %s\n", optarg);
 				exit_code = EXIT_FAILURE;
 				goto cleanup;
 			}
 			struct sway_nagbar_button *button;
 			button = calloc(sizeof(struct sway_nagbar_button), 1);
 			button->text = strdup(optarg);
+			button->type = NAGBAR_ACTION_COMMAND;
 			button->action = strdup(argv[optind]);
 			optind++;
 			list_add(nagbar.buttons, button);
@@ -121,6 +160,20 @@ int main(int argc, char **argv) {
 			free(nagbar.font);
 			nagbar.font = strdup(optarg);
 			break;
+		case 'l': // Detailed Message
+			free(nagbar.details.message);
+			if (strcmp(optarg, "-") == 0) {
+				nagbar.details.message = read_from_stdin();
+			} else {
+				nagbar.details.message = strdup(optarg);
+			}
+			nagbar.details.button_up.text = strdup("▲");
+			nagbar.details.button_down.text = strdup("▼");
+			break;
+		case 'L': // Detailed Button Text
+			free(button_details->text);
+			button_details->text = strdup(optarg);
+			break;
 		case 'm': // Message
 			free(nagbar.message);
 			nagbar.message = strdup(optarg);
@@ -129,13 +182,17 @@ int main(int argc, char **argv) {
 			free(nagbar.output.name);
 			nagbar.output.name = strdup(optarg);
 			break;
+		case 's': // Dismiss Button Text
+			free(button_close->text);
+			button_close->text = strdup(optarg);
+			break;
 		case 't': // Type
 			if (strcmp(optarg, "error") == 0) {
 				nagbar.type = NAGBAR_ERROR;
 			} else if (strcmp(optarg, "warning") == 0) {
 				nagbar.type = NAGBAR_WARNING;
 			} else {
-				fprintf(stderr, "Type must be either 'error' or 'warning'");
+				fprintf(stderr, "Type must be either 'error' or 'warning'\n");
 				exit_code = EXIT_FAILURE;
 				goto cleanup;
 			}
@@ -160,6 +217,13 @@ int main(int argc, char **argv) {
 		goto cleanup;
 	}
 
+	if (nagbar.details.message) {
+		list_add(nagbar.buttons, button_details);
+	} else {
+		free(button_details->text);
+		free(button_details);
+	}
+
 	wlr_log(WLR_DEBUG, "Output: %s", nagbar.output.name);
 	wlr_log(WLR_DEBUG, "Anchors: %d", nagbar.anchors);
 	wlr_log(WLR_DEBUG, "Type: %d", nagbar.type);
@@ -178,6 +242,8 @@ int main(int argc, char **argv) {
 	return exit_code;
 
 cleanup:
+	free(button_details->text);
+	free(button_details);
 	nagbar_destroy(&nagbar);
 	return exit_code;
 }
diff --git a/swaynagbar/nagbar.c b/swaynagbar/nagbar.c
index 22e5aff4..9e8bbb4b 100644
--- a/swaynagbar/nagbar.c
+++ b/swaynagbar/nagbar.c
@@ -34,8 +34,11 @@ static bool terminal_execute(char *terminal, char *command) {
 static void nagbar_button_execute(struct sway_nagbar *nagbar,
 		struct sway_nagbar_button *button) {
 	wlr_log(WLR_DEBUG, "Executing [%s]: %s", button->text, button->action);
-	if (!button->action) {
+	if (button->type == NAGBAR_ACTION_DISMISS) {
 		nagbar->run_display = false;
+	} else if (button->type == NAGBAR_ACTION_EXPAND) {
+		nagbar->details.visible = !nagbar->details.visible;
+		render_frame(nagbar);
 	} else {
 		if (fork() == 0) {
 			// Child process. Will be used to prevent zombie processes
@@ -119,8 +122,58 @@ static void wl_pointer_button(void *data, struct wl_pointer *wl_pointer,
 				&& x < nagbutton->x + nagbutton->width
 				&& y < nagbutton->y + nagbutton->height) {
 			nagbar_button_execute(nagbar, nagbutton);
+			return;
 		}
 	}
+
+	if (nagbar->details.visible &&
+			nagbar->details.total_lines != nagbar->details.visible_lines) {
+		struct sway_nagbar_button button_up = nagbar->details.button_up;
+		if (x >= button_up.x
+				&& y >= button_up.y
+				&& x < button_up.x + button_up.width
+				&& y < button_up.y + button_up.height
+				&& nagbar->details.offset > 0) {
+			nagbar->details.offset--;
+			render_frame(nagbar);
+			return;
+		}
+
+		struct sway_nagbar_button button_down = nagbar->details.button_down;
+		int bot = nagbar->details.total_lines - nagbar->details.visible_lines;
+		if (x >= button_down.x
+				&& y >= button_down.y
+				&& x < button_down.x + button_down.width
+				&& y < button_down.y + button_down.height
+				&& nagbar->details.offset < bot) {
+			nagbar->details.offset++;
+			render_frame(nagbar);
+			return;
+		}
+	}
+}
+
+static void wl_pointer_axis(void *data, struct wl_pointer *wl_pointer,
+		uint32_t time, uint32_t axis, wl_fixed_t value) {
+	struct sway_nagbar *nagbar = data;
+	if (!nagbar->details.visible
+			|| nagbar->pointer.x < nagbar->details.x
+			|| nagbar->pointer.y < nagbar->details.y
+			|| nagbar->pointer.x >= nagbar->details.x + nagbar->details.width
+			|| nagbar->pointer.y >= nagbar->details.y + nagbar->details.height
+			|| nagbar->details.total_lines == nagbar->details.visible_lines) {
+		return;
+	}
+
+	int direction = wl_fixed_to_int(value);
+	int bot = nagbar->details.total_lines - nagbar->details.visible_lines;
+	if (direction < 0 && nagbar->details.offset > 0) {
+		nagbar->details.offset--;
+	} else if (direction > 0 && nagbar->details.offset < bot) {
+		nagbar->details.offset++;
+	}
+
+	render_frame(nagbar);
 }
 
 static struct wl_pointer_listener pointer_listener = {
@@ -128,7 +181,7 @@ static struct wl_pointer_listener pointer_listener = {
 	.leave = nop,
 	.motion = wl_pointer_motion,
 	.button = wl_pointer_button,
-	.axis = nop,
+	.axis = wl_pointer_axis,
 	.frame = nop,
 	.axis_source = nop,
 	.axis_stop = nop,
@@ -329,6 +382,9 @@ void nagbar_destroy(struct sway_nagbar *nagbar) {
 		free(button);
 	}
 	list_free(nagbar->buttons);
+	free(nagbar->details.message);
+	free(nagbar->details.button_up.text);
+	free(nagbar->details.button_down.text);
 
 	if (nagbar->layer_surface) {
 		zwlr_layer_surface_v1_destroy(nagbar->layer_surface);
diff --git a/swaynagbar/render.c b/swaynagbar/render.c
index c0f59298..7bc2961e 100644
--- a/swaynagbar/render.c
+++ b/swaynagbar/render.c
@@ -23,11 +23,149 @@ static uint32_t render_message(cairo_t *cairo, struct sway_nagbar *nagbar) {
 	}
 
 	cairo_set_source_u32(cairo, nagbar->colors.text);
-	cairo_move_to(cairo, padding, (int)(height / 2.0 - text_height / 2.0));
+	cairo_move_to(cairo, padding, (int)(ideal_height - text_height) / 2);
 	pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s",
 			nagbar->message);
 
-	return nagbar->height;
+	return ideal_height;
+}
+
+static void render_details_scroll_button(cairo_t *cairo,
+		struct sway_nagbar *nagbar, struct sway_nagbar_button *button) {
+	int text_width, text_height;
+	get_text_size(cairo, nagbar->font, &text_width, &text_height,
+			nagbar->scale, true, "%s", button->text);
+
+	int border = NAGBAR_BUTTON_BORDER_THICKNESS * nagbar->scale;
+	int padding = NAGBAR_BUTTON_PADDING * nagbar->scale;
+
+	cairo_set_source_u32(cairo, nagbar->colors.border);
+	cairo_rectangle(cairo, button->x, button->y,
+			button->width, button->height);
+	cairo_fill(cairo);
+
+	cairo_set_source_u32(cairo, nagbar->colors.button_background);
+	cairo_rectangle(cairo, button->x + border, button->y + border,
+			button->width - (border * 2), button->height - (border * 2));
+	cairo_fill(cairo);
+
+	cairo_set_source_u32(cairo, nagbar->colors.text);
+	cairo_move_to(cairo, button->x + border + padding,
+			button->y + border + (button->height - text_height) / 2);
+	pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s", button->text);
+}
+
+static int get_detailed_scroll_button_width(cairo_t *cairo,
+		struct sway_nagbar *nagbar) {
+	int up_width, down_width, temp_height;
+	get_text_size(cairo, nagbar->font, &up_width, &temp_height,
+			nagbar->scale, true, "%s", nagbar->details.button_up.text);
+	get_text_size(cairo, nagbar->font, &down_width, &temp_height,
+			nagbar->scale, true, "%s", nagbar->details.button_down.text);
+
+	int text_width =  up_width > down_width ? up_width : down_width;
+	int border = NAGBAR_BUTTON_BORDER_THICKNESS * nagbar->scale;
+	int padding = NAGBAR_BUTTON_PADDING * nagbar->scale;
+
+	return text_width + border * 2 + padding * 2;
+}
+
+static uint32_t render_detailed(cairo_t *cairo, struct sway_nagbar *nagbar,
+		uint32_t y) {
+	uint32_t width = nagbar->width * nagbar->scale;
+	uint32_t height = nagbar->height * nagbar->scale;
+	height -= NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
+
+	int border = NAGBAR_DETAILS_BORDER_THICKNESS * nagbar->scale;
+	int padding = NAGBAR_MESSAGE_PADDING * nagbar->scale;
+	int decor = padding + border;
+
+	nagbar->details.x = decor;
+	nagbar->details.y = y + decor;
+	nagbar->details.width = width - decor * 2;
+
+	PangoLayout *layout = get_pango_layout(cairo, nagbar->font,
+			nagbar->details.message, nagbar->scale, true);
+	pango_layout_set_width(layout,
+			(nagbar->details.width - padding * 2) * PANGO_SCALE);
+	pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
+	pango_layout_set_single_paragraph_mode(layout, false);
+	pango_cairo_update_layout(cairo, layout);
+	nagbar->details.total_lines = pango_layout_get_line_count(layout);
+
+	PangoLayoutLine *line;
+	line = pango_layout_get_line_readonly(layout, nagbar->details.offset);
+	gint offset = line->start_index;
+	const char *text = pango_layout_get_text(layout);
+	pango_layout_set_text(layout, text + offset, strlen(text) - offset);
+
+	int text_width, text_height;
+	pango_cairo_update_layout(cairo, layout);
+	pango_layout_get_pixel_size(layout, &text_width, &text_height);
+
+	bool show_buttons = nagbar->details.offset > 0;
+	int button_width = get_detailed_scroll_button_width(cairo, nagbar);
+	if (show_buttons) {
+		nagbar->details.width -= button_width;
+		pango_layout_set_width(layout,
+				(nagbar->details.width - padding * 2) * PANGO_SCALE);
+	}
+
+	uint32_t ideal_height;
+	do {
+		ideal_height = nagbar->details.y + text_height + decor + padding * 2;
+		if (ideal_height > NAGBAR_MAX_HEIGHT) {
+			ideal_height = NAGBAR_MAX_HEIGHT;
+
+			if (!show_buttons) {
+				show_buttons = true;
+				nagbar->details.width -= button_width;
+				pango_layout_set_width(layout,
+						(nagbar->details.width - padding * 2) * PANGO_SCALE);
+			}
+		}
+
+		nagbar->details.height = ideal_height - nagbar->details.y - decor;
+		pango_layout_set_height(layout,
+				(nagbar->details.height - padding * 2) * PANGO_SCALE);
+		pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
+		pango_cairo_update_layout(cairo, layout);
+		pango_layout_get_pixel_size(layout, &text_width, &text_height);
+	} while (text_height != (nagbar->details.height - padding * 2));
+
+	nagbar->details.visible_lines = pango_layout_get_line_count(layout);
+
+	if (show_buttons) {
+		nagbar->details.button_up.x =
+			nagbar->details.x + nagbar->details.width;
+		nagbar->details.button_up.y = nagbar->details.y;
+		nagbar->details.button_up.width = button_width;
+		nagbar->details.button_up.height = nagbar->details.height / 2;
+		render_details_scroll_button(cairo, nagbar,
+				&nagbar->details.button_up);
+
+		nagbar->details.button_down.x =
+			nagbar->details.x + nagbar->details.width;
+		nagbar->details.button_down.y =
+			nagbar->details.button_up.y + nagbar->details.button_up.height;
+		nagbar->details.button_down.width = button_width;
+		nagbar->details.button_down.height = nagbar->details.height / 2;
+		render_details_scroll_button(cairo, nagbar,
+				&nagbar->details.button_down);
+	}
+
+	cairo_set_source_u32(cairo, nagbar->colors.border);
+	cairo_rectangle(cairo, nagbar->details.x, nagbar->details.y,
+			nagbar->details.width, nagbar->details.height);
+	cairo_fill(cairo);
+
+	cairo_move_to(cairo, nagbar->details.x + padding,
+			nagbar->details.y + padding);
+	cairo_set_source_u32(cairo, nagbar->colors.text);
+	pango_cairo_show_layout(cairo, layout);
+	g_object_unref(layout);
+
+	return ideal_height;
 }
 
 static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
@@ -50,7 +188,7 @@ static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
 	}
 
 	button->x = *x - border - text_width - padding * 2;
-	button->y = (int)(height / 2.0 - text_height / 2.0) - padding;
+	button->y = (int)(ideal_height - text_height) / 2 - padding;
 	button->width = text_width + padding * 2;
 	button->height = text_height + padding * 2;
 
@@ -70,7 +208,7 @@ static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
 
 	*x = button->x - border;
 
-	return nagbar->height;
+	return ideal_height;
 }
 
 static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
@@ -93,6 +231,11 @@ static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
 		}
 	}
 
+	if (nagbar->details.visible) {
+		h = render_detailed(cairo, nagbar, max_height);
+		max_height = h > max_height ? h : max_height;
+	}
+
 	int border = NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
 	if (max_height > nagbar->height) {
 		max_height += border;
@@ -102,7 +245,7 @@ static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
 			nagbar->width * nagbar->scale, border);
 	cairo_fill(cairo);
 
-	return max_height > nagbar->height ? max_height : nagbar->height;
+	return max_height;
 }
 
 void render_frame(struct sway_nagbar *nagbar) {
@@ -129,13 +272,16 @@ void render_frame(struct sway_nagbar *nagbar) {
 				nagbar->buffers,
 				nagbar->width * nagbar->scale,
 				nagbar->height * nagbar->scale);
-		cairo_t *shm = nagbar->current_buffer->cairo;
+		if (!nagbar->current_buffer) {
+			wlr_log(WLR_DEBUG, "Failed to get buffer. Skipping frame.");
+			return;
+		}
 
+		cairo_t *shm = nagbar->current_buffer->cairo;
 		cairo_save(shm);
 		cairo_set_operator(shm, CAIRO_OPERATOR_CLEAR);
 		cairo_paint(shm);
 		cairo_restore(shm);
-
 		cairo_set_source_surface(shm, recorder, 0.0, 0.0);
 		cairo_paint(shm);
 
diff --git a/swaynagbar/swaynagbar.1.scd b/swaynagbar/swaynagbar.1.scd
index 4235e2ea..2a34ae68 100644
--- a/swaynagbar/swaynagbar.1.scd
+++ b/swaynagbar/swaynagbar.1.scd
@@ -25,6 +25,15 @@ _swaynagbar_ [options...]
 *-h, --help*
 	Show help message and quit.
 
+*-l, --detailed-message <msg>*
+	Set the detailed message. A button to toggle details will be added. Details
+	are shown in a scrollable multi-line text area. If _msg_ is _-_, then the
+	detailed message will be read from stdin.
+
+*-L, --detailed-button <text>*
+	Set the text for the button that toggles details. This has no effect if
+	there is not a detailed message. The default is _Toggle Details_.
+
 *-m, --message <msg>*
 	Set the message text.
 
@@ -33,6 +42,9 @@ _swaynagbar_ [options...]
 	_xdg\_output\_manager_ is not supported, then the first detected output
 	will be used
 
+*-s, --dismiss-button <text>*
+	Sets the text for the dismiss nagbar button. The default is _X_.
+
 *-t, --type error|warning*
 	Set the message type.