diff --git a/code/API_definitions/number-recycling.yaml b/code/API_definitions/number-recycling.yaml
index 0998692..e3e094f 100644
--- a/code/API_definitions/number-recycling.yaml
+++ b/code/API_definitions/number-recycling.yaml
@@ -344,6 +344,7 @@ components:
                 code: SERVICE_NOT_APPLICABLE
                 message: The service is not available for the provided phone number
             UnnecessaryIdentifier:
+              description: An explicit identifier is provided when a phone number has already been identified from the access token
               value:
                 status: 422
                 code: UNNECESSARY_IDENTIFIER