diff --git a/services/outside_network.c b/services/outside_network.c
index 3af16a641..b7f844d49 100644
--- a/services/outside_network.c
+++ b/services/outside_network.c
@@ -1440,6 +1440,7 @@ serviced_tcp_initiate(struct outside_network* outnet,
 	}
 }
 
+/** Send serviced query over TCP return false on initial failure */
 static int
 serviced_tcp_send(struct serviced_query* sq, ldns_buffer* buff)
 {