diff --git a/sys/net/if_llatbl.c b/sys/net/if_llatbl.c
index f89aafa9027c..7ef1c9a20050 100644
--- a/sys/net/if_llatbl.c
+++ b/sys/net/if_llatbl.c
@@ -106,6 +106,8 @@ llentry_free(struct llentry *lle)
 /*
  * Update an llentry for address dst (equivalent to rtalloc for new-arp)
  * Caller must pass in a valid struct llentry *
+ *
+ * if found the llentry * is returned referenced and unlocked
  */
 int
 llentry_update(struct llentry **llep, struct lltable *lt,