diff --git a/sys/kern/vfs_aio.c b/sys/kern/vfs_aio.c
index fbfa5a1300de..25da74618cdd 100644
--- a/sys/kern/vfs_aio.c
+++ b/sys/kern/vfs_aio.c
@@ -872,6 +872,7 @@ aio_daemon(void *_id)
 	 */
 	fdfree(td);
 
+	/* The daemon resides in its own pgrp. */
 	setsid(td, NULL);
 
 	/*