Index: uspace/lib/c/include/ipc/loc.h
===================================================================
--- uspace/lib/c/include/ipc/loc.h	(revision cce8a8318e65105693f8390140c8d7327f39cac6)
+++ uspace/lib/c/include/ipc/loc.h	(revision 12f9f0d0827e1f7c54cf26d56ffabf49e22936f7)
@@ -57,4 +57,5 @@
 	LOC_SERVICE_GET_NAME,
 	LOC_NAMESPACE_GET_ID,
+	LOC_CALLBACK_CREATE,
 	LOC_CATEGORY_GET_ID,
 	LOC_CATEGORY_GET_SVCS,
@@ -68,4 +69,8 @@
 	LOC_GET_SERVICES
 } loc_request_t;
+
+typedef enum {
+	LOC_EVENT_CAT_CHANGE = IPC_FIRST_USER_METHOD
+} loc_event_t;
 
 /** Ports provided by location service.