diff --git a/boards/rp-pico/src/lib.rs b/boards/rp-pico/src/lib.rs
index 7510ce2..f994d14 100644
--- a/boards/rp-pico/src/lib.rs
+++ b/boards/rp-pico/src/lib.rs
@@ -18,38 +18,225 @@ pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
 pub use hal::pac;
 
 hal::bsp_pins!(
+    /// GPIO 0 supports following functions:
+    /// - `SPI0 RX  `
+    /// - `UART0 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM0 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio0 { name: gpio0 },
+
+    /// GPIO 1 supports following functions:
+    /// - `SPI0 CSn `
+    /// - `UART0 RX `
+    /// - `I2C0 SCL`
+    /// - `PWM0 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio1 { name: gpio1 },
+
+    /// GPIO 2 supports following functions:
+    /// - `SPI0 SCK `
+    /// - `UART0 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM1 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio2 { name: gpio2 },
+
+    /// GPIO 3 supports following functions:
+    /// - `SPI0 TX  `
+    /// - `UART0 RTS`
+    /// - `I2C1 SCL`
+    /// - `PWM1 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio3 { name: gpio3 },
+
+    /// GPIO 4 supports following functions:
+    /// - `SPI0 RX  `
+    /// - `UART1 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM2 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio4 { name: gpio4 },
+
+    /// GPIO 5 supports following functions:
+    /// - `SPI0 CSn `
+    /// - `UART1 RX `
+    /// - `I2C0 SCL`
+    /// - `PWM2 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio5 { name: gpio5 },
+
+    /// GPIO 6 supports following functions:
+    /// - `SPI0 SCK `
+    /// - `UART1 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM3 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio6 { name: gpio6 },
+
+    /// GPIO 7 supports following functions:
+    /// - `SPI0 TX  `
+    /// - `UART1 RTS`
+    /// - `I2C1 SCL`
+    /// - `PWM3 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio7 { name: gpio7 },
+
+    /// GPIO 8 supports following functions:
+    /// - `SPI1 RX  `
+    /// - `UART1 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM4 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio8 { name: gpio8 },
+
+    /// GPIO 9 supports following functions:
+    /// - `SPI1 CSn `
+    /// - `UART1 RX `
+    /// - `I2C0 SCL`
+    /// - `PWM4 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio9 { name: gpio9 },
+
+    /// GPIO 10 supports following functions:
+    /// - `SPI1 SCK`
+    /// - `UART1 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM5 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio10 { name: gpio10 },
+
+    /// GPIO 11 supports following functions:
+    /// - `SPI1 TX `
+    /// - `UART1 RTS`
+    /// - `I2C1 SCL`
+    /// - `PWM5 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio11 { name: gpio11 },
+
+    /// GPIO 12 supports following functions:
+    /// - `SPI1 RX `
+    /// - `UART0 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM6 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio12 { name: gpio12 },
+
+    /// GPIO 13 supports following functions:
+    /// - `SPI1 CSn`
+    /// - `UART0 RX `
+    /// - `I2C0 SCL`
+    /// - `PWM6 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio13 { name: gpio13 },
+
+    /// GPIO 14 supports following functions:
+    /// - `SPI1 SCK`
+    /// - `UART0 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM7 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio14 { name: gpio14 },
+
+    /// GPIO 15 supports following functions:
+    /// - `SPI1 TX `
+    /// - `UART0 RTS`
+    /// - `I2C1 SCL`
+    /// - `PWM7 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio15 { name: gpio15 },
+
+    /// GPIO 16 supports following functions:
+    /// - `SPI0 RX `
+    /// - `UART0 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM0 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio16 { name: gpio16 },
+
+    /// GPIO 17 supports following functions:
+    /// - `SPI0 CSn`
+    /// - `UART0 RX `
+    /// - `I2C0 SCL`
+    /// - `PWM0 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio17 { name: gpio17 },
+
+    /// GPIO 18 supports following functions:
+    /// - `SPI0 SCK`
+    /// - `UART0 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM1 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio18 { name: gpio18 },
+
+    /// GPIO 19 supports following functions:
+    /// - `SPI0 TX `
+    /// - `UART0 RTS`
+    /// - `I2C1 SCL`
+    /// - `PWM1 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio19 { name: gpio19 },
+
+    /// GPIO 20 supports following functions:
+    /// - `SPI0 RX `
+    /// - `UART1 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM2 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio20 { name: gpio20 },
+
+    /// GPIO 21 supports following functions:
+    /// - `SPI0 CSn`
+    /// - `UART1 RX `
+    /// - `I2C0 SCL`
+    /// - `PWM2 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio21 { name: gpio21 },
+
+    /// GPIO 22 supports following functions:
+    /// - `SPI0 SCK`
+    /// - `UART1 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM3 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio22 { name: gpio22 },
+
+    /// GPIO 23 is connected to b_power_save of the Raspberry Pi Pico board.
     Gpio23 { name: b_power_save },
+
+    /// GPIO 24 is connected to vbus_detect of the Raspberry Pi Pico board.
     Gpio24 { name: vbus_detect },
+
+    /// GPIO 25 is connected to the LED of the Raspberry Pi Pico board.
     Gpio25 { name: led },
+
+    /// GPIO 26 supports following functions:
+    /// - `SPI1 SCK`
+    /// - `UART1 CTS`
+    /// - `I2C1 SDA`
+    /// - `PWM5 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio26 { name: gpio26 },
+
+    /// GPIO 27 supports following functions:
+    /// - `SPI1 TX `
+    /// - `UART1 RTS`
+    /// - `I2C1 SCL`
+    /// - `PWM5 B`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio27 { name: gpio27 },
+
+    /// GPIO 28 supports following functions:
+    /// - `SPI1 RX `
+    /// - `UART0 TX `
+    /// - `I2C0 SDA`
+    /// - `PWM6 A`
+    /// - `SIO`, `PIO0`, `PIO1`
     Gpio28 { name: gpio28 },
-    Gpio29 {
-        name: voltage_monitor
-    },
+
+    /// GPIO 29 is connected to voltage_monitor of the Raspberry Pi Pico board.
+    Gpio29 { name: voltage_monitor },
 );
 
 pub const XOSC_CRYSTAL_FREQ: u32 = 12_000_000;