diff --git a/specs.json b/specs.json
index b1833b9..6147596 100644
--- a/specs.json
+++ b/specs.json
@@ -670,6 +670,7 @@
       "replace": "array",
       "keywords": "array",
       "endpointing": "boolean | number",
+      "utteranceEndMs": "number",
       "vadTurnoff": "number",
       "tag": "string"
     }