diff --git a/website/docs/user-guide/features/delegation.md b/website/docs/user-guide/features/delegation.md
index ec09d148f94..077e2083d7a 100644
--- a/website/docs/user-guide/features/delegation.md
+++ b/website/docs/user-guide/features/delegation.md
@@ -274,6 +274,7 @@ delegation:
   model: "qwen2.5-coder"
   base_url: "http://localhost:1234/v1"
   api_key: "local-key"
+  # api_mode: "anthropic_messages"  # Optional. Wire protocol override for base_url ("chat_completions", "codex_responses", or "anthropic_messages"). Empty = auto-detect from URL (e.g. /anthropic suffix). Set explicitly for endpoints the heuristic can't classify (Azure AI Foundry, MiniMax, Zhipu GLM, LiteLLM proxies, …).
 ```
 
 :::tip