diff --git a/include/osmocom/msc/vlr_sgs.h b/include/osmocom/msc/vlr_sgs.h
index aade5d3..7193fa5 100644
--- a/include/osmocom/msc/vlr_sgs.h
+++ b/include/osmocom/msc/vlr_sgs.h
@@ -81,7 +81,7 @@
 typedef void (*vlr_sgs_lu_response_cb_t) (struct sgs_lu_response *response);
 
 /* This callback function is called in cases where a paging request is required
- * after the LU is completed */
+ * after the LU is completed or when a paging expired */
 typedef int (*vlr_sgs_lu_paging_cb_t) (struct vlr_subscr *vsub, enum sgsap_service_ind serv_ind);
 
 /* This callback function is called to send the MM info to the UE. */