diff --git a/docs/intent_conversation_api.md b/docs/intent_conversation_api.md
index c54c6904..b1e0bf9f 100644
--- a/docs/intent_conversation_api.md
+++ b/docs/intent_conversation_api.md
@@ -34,6 +34,7 @@ The following input fields are available:
 |-------------------|--------|---------------------------------------------------------------------------------------------|
 | `text`            | string | Input sentence.                                                                             |
 | `language`        | string | Optional. Language of the input sentence (defaults to configured language).                 |
+| `agent_id`        | string | Optional. Conversation agent to process the request (defaults _home_assistant_).            |
 | `conversation_id` | string | Optional. Unique id to [track conversation](#conversation-id). Generated by Home Assistant. |