diff --git a/src/chunk.rs b/src/chunk.rs
index 106c253..b2026f0 100644
--- a/src/chunk.rs
+++ b/src/chunk.rs
@@ -114,7 +114,7 @@ impl<C: Config> Chunks<C> {
         self.chunks.get_mut(&pos.into())
     }
 
-    /// Removes all chunks for which `f` returns `true`.
+    /// Removes all chunks for which `f` returns `false`.
     ///
     /// All chunks are visited in an unspecified order.
     pub fn retain(&mut self, mut f: impl FnMut(ChunkPos, &mut LoadedChunk<C>) -> bool) {
diff --git a/src/client.rs b/src/client.rs
index 154b883..77d42f1 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -78,7 +78,7 @@ impl<C: Config> Clients<C> {
         self.slab.remove(client.0).map(|c| c.state)
     }
 
-    /// Deletes all clients from the server for which `f` returns `true`.
+    /// Deletes all clients from the server for which `f` returns `false`.
     ///
     /// All clients are visited in an unspecified order.
     pub fn retain(&mut self, mut f: impl FnMut(ClientId, &mut Client<C>) -> bool) {
diff --git a/src/entity.rs b/src/entity.rs
index c54d22b..6524a20 100644
--- a/src/entity.rs
+++ b/src/entity.rs
@@ -121,7 +121,7 @@ impl<C: Config> Entities<C> {
         })
     }
 
-    /// Removes all entities from the server for which `f` returns `true`.
+    /// Removes all entities from the server for which `f` returns `false`.
     ///
     /// All entities are visited in an unspecified order.
     pub fn retain(&mut self, mut f: impl FnMut(EntityId, &mut Entity<C>) -> bool) {
diff --git a/src/player_list.rs b/src/player_list.rs
index 35f0069..f116004 100644
--- a/src/player_list.rs
+++ b/src/player_list.rs
@@ -175,7 +175,7 @@ impl<C: Config> PlayerList<C> {
         }
     }
 
-    /// Removes all entries from the player list for which `f` returns `true`.
+    /// Removes all entries from the player list for which `f` returns `false`.
     ///
     /// All entries are visited in an unspecified order.
     pub fn retain(&mut self, mut f: impl FnMut(Uuid, &mut PlayerListEntry) -> bool) {
diff --git a/src/world.rs b/src/world.rs
index 2c8e7ca..1f1f3bc 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -67,7 +67,7 @@ impl<C: Config> Worlds<C> {
         self.slab.remove(world.0).is_some()
     }
 
-    /// Removes all worlds from the server for which `f` returns `true`.
+    /// Removes all worlds from the server for which `f` returns `false`.
     ///
     /// All worlds are visited in an unspecified order.
     pub fn retain(&mut self, mut f: impl FnMut(WorldId, &mut World<C>) -> bool) {