diff --git a/API-Reference.md b/API-Reference.md
index 5c29ffd..bcda6e7 100644
--- a/API-Reference.md
+++ b/API-Reference.md
@@ -97,7 +97,7 @@ A dictionary containing the chat completion response with the following structur
 }
 ```
 
-The `_metadata` field is added by the client library and is not part of the OpenAI API response format. See the [Security Guide](security-guide.md) for how to interpret and verify `tpm_attestation`.
+The `_metadata` field is added by the client library and is not part of the OpenAI API response format. See the [Security Guide](Security-Guide) for how to interpret and verify `tpm_attestation`.
 
 #### acreate(model, messages, **kwargs)