@@ -5,6 +5,13 @@
//! Note: Without additional hardware, PC13 should not be used to drive an LED, see page 5.1.2 of
//! the reference manaual for an explanation. This is not an issue on the blue pill.
+//! This example assumes that a LED is connected to PC13 which is where an LED is connected on the
+//! [blue_pill] board. If you have different hardware, you need to change which gpio pin is used.
+//!
+//! Note: PC13 can not source much current and should not be used to drive an LED directly.
+//! [blue_pill]: http://wiki.stm32duino.com/index.php?title=Blue_Pill
+
#![deny(unsafe_code)]
#![deny(warnings)]
#![no_std]