diff --git a/src/vnet/session/session.api b/src/vnet/session/session.api
index 43bde1a..0eb773c 100644
--- a/src/vnet/session/session.api
+++ b/src/vnet/session/session.api
@@ -252,6 +252,34 @@
   string netns[64];
 };
 
+/** \brief add/del application namespace
+    @param client_index - opaque cookie to identify the sender
+                          client to vpp direction only
+    @param context - sender context, to match reply w/ request
+    @param secret - secret shared between app and vpp
+    @param sw_if_index - local interface that "supports" namespace. Set to
+                         ~0 if no preference
+    @param ip4_fib_id - id of ip4 fib that "supports" the namespace. Ignored
+                        if sw_if_index set.
+    @param ip6_fib_id - id of ip6 fib that "supports" the namespace. Ignored
+                        if sw_if_index set.
+    @param namespace_id - namespace id
+    @param netns - linux net namespace
+    @param sock_name - socket name (path, abstract socket name)
+*/
+define app_namespace_add_del_v3 {
+  u32 client_index;
+  u32 context;
+  u64 secret;
+  bool is_add [default=true];
+  vl_api_interface_index_t sw_if_index [default=0xffffffff];
+  u32 ip4_fib_id;
+  u32 ip6_fib_id;
+  string namespace_id[64];
+  string netns[64];
+  string sock_name[];
+};
+
 /** \brief Reply for app namespace add/del
     @param context - returned sender context, to match reply w/ request
     @param retval - return code
@@ -277,6 +305,13 @@
   u32 appns_index;
 };
 
+define app_namespace_add_del_v3_reply
+{
+  u32 context;
+  i32 retval;
+  u32 appns_index;
+};
+
 enum session_rule_scope {
 	SESSION_RULE_SCOPE_API_GLOBAL = 0,
 	SESSION_RULE_SCOPE_API_LOCAL = 1,