diff --git a/lib/jambonz/specs.json b/lib/jambonz/specs.json
index b7b4fad..ff02a0f 100644
--- a/lib/jambonz/specs.json
+++ b/lib/jambonz/specs.json
@@ -281,6 +281,7 @@
       "tts": "#synthesizer",
       "prompt": "string",
       "thinkingMusic": "string",
+      "timeout": "number",
       "actionHook": "object|string",
       "eventHook": "object|string"
     },