diff --git a/headers/private/kernel/vm/vm_types.h b/headers/private/kernel/vm/vm_types.h
index f37f191855..138f8a144b 100644
--- a/headers/private/kernel/vm/vm_types.h
+++ b/headers/private/kernel/vm/vm_types.h
@@ -123,6 +123,8 @@ private:
 public:
 	page_num_t				cache_offset;
 								// in page size units
+								// TODO: Only 32 bit on 32 bit platforms!
+								// Introduce a new 64 bit type page_off_t!
 
 	SplayTreeLink<vm_page>	cache_link;
 	vm_page*				cache_next;