diff --git a/code/API_definitions/quality-on-demand.yaml b/code/API_definitions/quality-on-demand.yaml
index 40035b987..cab2fba70 100644
--- a/code/API_definitions/quality-on-demand.yaml
+++ b/code/API_definitions/quality-on-demand.yaml
@@ -1060,7 +1060,7 @@ components:
                 code: OUT_OF_RANGE
                 message: Client specified an invalid range.
             DurationOutOfRangeForQoSProfile:
-              description: The requested duration is out of the allowed range for the specific QoS profile
+              description: NOTE - this error response cannot be returned by the `/extend` operation and will be removed from the API definition in the next version.
               value:
                 status: 400
                 code: QUALITY_ON_DEMAND.DURATION_OUT_OF_RANGE