diff --git a/src/fsfw_hal/common/gpio/gpioDefinitions.h b/src/fsfw_hal/common/gpio/gpioDefinitions.h
index 9f5618e4..9f8b5e32 100644
--- a/src/fsfw_hal/common/gpio/gpioDefinitions.h
+++ b/src/fsfw_hal/common/gpio/gpioDefinitions.h
@@ -6,7 +6,8 @@
 #include <unordered_map>
 
 #ifdef PLATFORM_WIN
-// What is this crap?
+// Defined in Windows header for whatever reason, and leads to nameclash issues with
+// class enums which have entries of the same name.
 #undef IN
 #undef OUT
 #undef CALLBACK