diff --git a/lib/jambonz/specs.json b/lib/jambonz/specs.json
index 0691668..c46168e 100644
--- a/lib/jambonz/specs.json
+++ b/lib/jambonz/specs.json
@@ -9,6 +9,18 @@
       "status"
     ]
   },
+  "sip:refer": {
+    "properties": {
+      "referTo": "string",
+      "referredBy": "string",
+      "headers": "object",
+      "actionHook": "object|string",
+      "eventHook": "object|string"
+    },
+    "required": [
+      "referTo"
+    ]
+  },
   "dequeue": {
     "properties": {
       "name": "string",
diff --git a/package.json b/package.json
index 40bd465..bbc5305 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jambonz/node-client",
-  "version": "0.2.10",
+  "version": "0.2.11",
   "description": "",
   "main": "lib/index.js",
   "scripts": {