diff --git a/src/ac/ac.h b/src/ac/ac.h
index 0c08cb60..6b457af4 100644
--- a/src/ac/ac.h
+++ b/src/ac/ac.h
@@ -6,3 +6,14 @@ extern int ac_global_init();
 extern mbag_t ac_config;	
 extern struct cw_actiondef capwap_actions;
 
+
+/* the protocol we understand */
+
+enum {
+	AC_PROTO_CAPWAP=0,
+	AC_PROTO_LWAPP=1,
+	AC_PROTO_UNKNOWN
+};
+
+
+