diff --git a/docs/API requests.md b/docs/API requests.md
index 1f54b14..59deef0 100644
--- a/docs/API requests.md	
+++ b/docs/API requests.md	
@@ -159,7 +159,7 @@ The body of the request MUST include an object which includes an `arguments` obj
 }
 ```
 
-A successful response MUST be of type [NcMethodResult](https://specs.amwa.tv/ms-05-02/latest/docs/Framework.html#ncmethodresult). If the request encountered an error then the response result returned MUST inherit from [NcMethodResultError](https://specs.amwa.tv/ms-05-02/latest/docs/Framework.html#ncmethodresulterror) and include an errorMessage of type [NcString](https://specs.amwa.tv/ms-05-02/latest/docs/Framework.html#primitives).
+A successful response MUST be of type [NcMethodResult](https://specs.amwa.tv/ms-05-02/latest/docs/Framework.html#ncmethodresult). If the request encountered an error then the response MUST either be of the type, or inherited from the type, [NcMethodResultError](https://specs.amwa.tv/ms-05-02/latest/docs/Framework.html#ncmethodresulterror) and include an errorMessage of type [NcString](https://specs.amwa.tv/ms-05-02/latest/docs/Framework.html#primitives).
 
 This is equivalent to invoking the specified method.