Index: kernel/generic/include/lib/refcount.h
===================================================================
--- kernel/generic/include/lib/refcount.h	(revision e3444229c8e3295e9e2bed75246c19263f3c51a6)
+++ kernel/generic/include/lib/refcount.h	(revision 464041698a3d92d07aded8be130230a18da695d3)
@@ -64,7 +64,7 @@
 static inline void refcount_up(atomic_refcount_t *rc)
 {
-	// XXX: We can use relaxed operation because acquiring a reference
-	//      implies no ordering relationships. A reference-counted object
-	//      still needs to be synchronized independently of the refcount.
+	// NOTE: We can use relaxed operation because acquiring a reference
+	//       implies no ordering relationships. A reference-counted object
+	//       still needs to be synchronized independently of the refcount.
 
 	int old = atomic_fetch_add_explicit(&rc->__cnt, 1,
@@ -96,6 +96,6 @@
 static inline bool refcount_down(atomic_refcount_t *rc)
 {
-	// XXX: The decrementers don't need to synchronize with each other,
-	//      but they do need to synchronize with the one doing deallocation.
+	// NOTE: The decrementers don't need to synchronize with each other,
+	//       but they do need to synchronize with the one doing deallocation.
 	int old = atomic_fetch_sub_explicit(&rc->__cnt, 1,
 	    memory_order_release);
@@ -104,6 +104,6 @@
 
 	if (old == 0) {
-		// XXX: We are holding the last reference, so we must now
-		//      synchronize with all the other decrementers.
+		// NOTE: We are holding the last reference, so we must now
+		//       synchronize with all the other decrementers.
 
 		int val = atomic_load_explicit(&rc->__cnt,