diff --git a/src/gpio.rs b/src/gpio.rs
index 167cb11db0e68dfdb5fa3356e9da1fd8509ce161..3d6c815b40a8c8c9fc3d45f33b61b5cdea30fc0a 100644
--- a/src/gpio.rs
+++ b/src/gpio.rs
@@ -488,6 +488,7 @@ macro_rules! gpio {
     }
 }
 
+// TODO, check if some GPIO should be excluded
 gpio!(GPIOA, gpioa, gpioa, gpioaen, gpioarst, PAx, [
     PA0: (pa0, 0, Input<Floating>, AFRL),
     PA1: (pa1, 1, Input<Floating>, AFRL),