diff --git a/src/action.c b/src/action.c
index 870a839..ee68072 100644
--- a/src/action.c
+++ b/src/action.c
@@ -133,6 +133,12 @@
 	return 0;
 }
 
+/*
+ * Do resolve error management callback
+ * returns:
+ *  0 if we can trash answser items.
+ *  1 when safely ignored and we must kept answer items
+ */
 int act_resolution_error_cb(struct dns_requester *requester, int error_code)
 {
 	struct stream *stream;