cosmetic: add comment to hnbgw_cnlink_init()
diff --git a/src/hnbgw_cn.c b/src/hnbgw_cn.c
index 921cf22..cabd4ff 100644
--- a/src/hnbgw_cn.c
+++ b/src/hnbgw_cn.c
@@ -346,6 +346,8 @@
 }
 
 
+/* Set up a link towards the core network for the circuit switched (is_ps == 0)
+ * or packet switched (is_ps != 0) domain. */
 struct hnbgw_cnlink *hnbgw_cnlink_init(struct hnb_gw *gw, const char *host, uint16_t port, int is_ps)
 {
 	struct hnbgw_cnlink *cnlink = talloc_zero(gw, struct hnbgw_cnlink);