diff --git a/src/vnet/session/session.api b/src/vnet/session/session.api
index fee98c2..e6f3b02 100644
--- a/src/vnet/session/session.api
+++ b/src/vnet/session/session.api
@@ -359,6 +359,44 @@
   u8 namespace_id[64];
 };
 
+/** \brief add/del session rule
+    @param client_index - opaque cookie to identify the sender
+                          client to vpp direction only
+    @param context - sender context, to match reply w/ request
+    @param transport_proto - transport protocol (0 - tcp 1 - udp)
+    @param is_ip4 - flag to indicate if ip addresses are ip4 or 6
+    @param lcl_ip - local ip
+    @param lcl_plen - local prefix length
+    @param rmt_ip - remote ip
+    @param rmt_ple - remote prefix length
+    @param lcl_port - local port
+    @param rmt_port - remote port
+    @param action_index - the only action defined now is forward to 
+    						  application with index action_index
+    	@param is_add - flag to indicate if add or del
+    	@param appns_index - application namespace where rule is to be applied
+    						 to
+    	@param scope - flag that indicates scope of the rule: global or local.
+    				   If 0, default is global, 1 is global 2 is local, 3 is
+    				   both
+*/
+autoreply define session_rule_add_del {
+  u32 client_index;
+  u32 context;
+  u8 transport_proto;
+  u8 is_ip4;
+  u8 lcl_ip[16];
+  u8 lcl_plen;
+  u8 rmt_ip[16];
+  u8 rmt_plen;
+  u16 lcl_port;
+  u16 rmt_port;
+  u32 action_index;
+  u8 is_add;
+  u32 appns_index;
+  u8 scope;
+};
+
 /*
  * Local Variables:
  * eval: (c-set-style "gnu")