diff --git a/lib/tasks/specs.json b/lib/tasks/specs.json
index a0924591..d0eb2a26 100644
--- a/lib/tasks/specs.json
+++ b/lib/tasks/specs.json
@@ -127,6 +127,7 @@
       "speech_recognizer_language": "string",
       "tag": "object",
       "to": "#target",
+      "headers": "object",
       "timeout": "number"
     },
     "required": [