diff --git a/src/t2iapi/operation/operation_requests.proto b/src/t2iapi/operation/operation_requests.proto
index 4ee991c..9f6b281 100644
--- a/src/t2iapi/operation/operation_requests.proto
+++ b/src/t2iapi/operation/operation_requests.proto
@@ -27,6 +27,8 @@ Request to set the @InvocationEffectiveTimeout of the pm:AbstractOperationDescri
 that is less than or equal to the requested threshold.
 */
 message SetInvocationEffectiveTimeoutLteToThresholdRequest {
-    string handle = 1;
-    string threshold = 2;
-}
\ No newline at end of file
+    string handle = 1;  // handle of the pm:AbstractOperationDescriptor for which the @InvocationEffectiveTimeout
+                        // shall be set
+    string threshold = 2;  // threshold value for which applies that the @InvocationEffectiveTimeout is less than or
+                           // equal to this threshold value
+}