diff --git a/servers/slapd/back-monitor/database.c b/servers/slapd/back-monitor/database.c
index 47384cec52..2223997cb0 100644
--- a/servers/slapd/back-monitor/database.c
+++ b/servers/slapd/back-monitor/database.c
@@ -441,6 +441,9 @@ monitor_back_register_database(
 	if ( rc != 0 ) {
 		goto done;
 	}
+	/* database_init_one advanced ep past where we want.
+	 * But it stored the entry we want in mp->mp_next.
+	 */
 	ep = &mp->mp_next;
 
 done:;