diff --git a/litellm/types/guardrails.py b/litellm/types/guardrails.py
index d5abf5c8fbf..38fc2c3eef8 100644
--- a/litellm/types/guardrails.py
+++ b/litellm/types/guardrails.py
@@ -656,9 +656,9 @@ class BaseLitellmParams(
         default=None,
         description="For /v1/realtime sessions: automatically close the session after this many guardrail violations.",
     )
-    on_violation: Optional[Literal["warn", "end_session"]] = Field(
+    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' rejects the request (same as the default guardrail behaviour).",
     )
     realtime_violation_message: Optional[str] = Field(
         default=None,