diff --git a/litellm/types/guardrails.py b/litellm/types/guardrails.py
index 413a340f3c3..370fa493d19 100644
--- a/litellm/types/guardrails.py
+++ b/litellm/types/guardrails.py
@@ -658,7 +658,7 @@ class BaseLitellmParams(
     )
     on_violation: Optional[Literal["warn", "end_session", "block"]] = Field(
         default=None,
-        description="For /v1/realtime sessions: 'warn' speaks the violation message and continues; 'end_session' speaks the message and closes the connection.",
+        description="For /v1/realtime sessions: 'warn' speaks the violation message and continues; 'end_session' speaks the message and closes the connection. 'block' blocks the request (used by guardrails such as MCP Security).",
     )
     realtime_violation_message: Optional[str] = Field(
         default=None,