diff --git a/openbsc/src/libcommon/gsup_client.c b/openbsc/src/libcommon/gsup_client.c
index 0360e0a..4c1fe61 100644
--- a/openbsc/src/libcommon/gsup_client.c
+++ b/openbsc/src/libcommon/gsup_client.c
@@ -155,6 +155,7 @@
 	int rc;
 	struct msgb *msg_tx;
 
+	/* If the oap_state is disabled, this will reject the messages. */
 	rc = oap_client_handle(&gsupc->oap_state, msg_rx, &msg_tx);
 	msgb_free(msg_rx);
 	if (rc < 0)