diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 811c5cef45d..8cc4a57cdaf 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -2558,6 +2558,9 @@ restart_unlocked:
 		;
 
 	if (length > 0) {
+		/*
+		 * Write out vnode metadata, e.g. indirect blocks.
+		 */
 restartsync:
 		TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
 			if (bp->b_lblkno > 0)