diff --git a/modules/axhal/src/arch/mod.rs b/modules/axhal/src/arch/mod.rs
index b255a74245..43d2c73a4a 100644
--- a/modules/axhal/src/arch/mod.rs
+++ b/modules/axhal/src/arch/mod.rs
@@ -16,7 +16,10 @@ cfg_if::cfg_if! {
 /// Cache operations.
 #[derive(Debug, Clone, Copy)]
 pub enum CacheOp {
+    // Write back to memory
     Clean,
+    // Invalidate cache
     Invalidate,
+    // Clean and invalidate
     CleanAndInvalidate,
 }