diff --git a/include/unicorn/unicorn.h b/include/unicorn/unicorn.h
index 31d752e0..9dde3378 100644
--- a/include/unicorn/unicorn.h
+++ b/include/unicorn/unicorn.h
@@ -248,6 +248,8 @@ typedef enum uc_hook_type {
 // Hook type for all events of illegal memory access
 #define UC_HOOK_MEM_INVALID (UC_HOOK_MEM_UNMAPPED + UC_HOOK_MEM_PROT)
 // Hook type for all events of valid memory access
+// NOTE: UC_HOOK_MEM_READ is triggered before UC_HOOK_MEM_READ_PROT and UC_HOOK_MEM_READ_UNMAPPED, so
+//       this hook may technically trigger on some invalid reads. 
 #define UC_HOOK_MEM_VALID (UC_HOOK_MEM_READ + UC_HOOK_MEM_WRITE + UC_HOOK_MEM_FETCH)
 
 /*