diff --git a/sys/ufs/ext2fs/ext2fs_alloc.c b/sys/ufs/ext2fs/ext2fs_alloc.c
index 348116cbdf4d..eb07076820f7 100644
--- a/sys/ufs/ext2fs/ext2fs_alloc.c
+++ b/sys/ufs/ext2fs/ext2fs_alloc.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ext2fs_alloc.c,v 1.50 2016/08/20 19:51:50 jdolecek Exp $	*/
+/*	$NetBSD: ext2fs_alloc.c,v 1.51 2016/08/20 19:53:43 jdolecek Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -60,7 +60,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ext2fs_alloc.c,v 1.50 2016/08/20 19:51:50 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ext2fs_alloc.c,v 1.51 2016/08/20 19:53:43 jdolecek Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -418,7 +418,10 @@ ext2fs_alloccg(struct inode *ip, int cg, daddr_t bpref, int size)
 
 	bno = ext2fs_mapsearch(fs, bbp, bpref);
 #if 0
-	/* XXX jdolecek mapsearch actually never fails, it panics instead */
+	/*
+	 * XXX jdolecek mapsearch actually never fails, it panics instead.
+	 * If re-enabling, make sure to brele() before returning.
+	 */
 	if (bno < 0)
 		return 0;
 #endif