diff --git a/code/API_definitions/number-recycling.yaml b/code/API_definitions/number-recycling.yaml
index 4dfbf14..b0bbd16 100644
--- a/code/API_definitions/number-recycling.yaml
+++ b/code/API_definitions/number-recycling.yaml
@@ -60,8 +60,8 @@ info:
 
     ## Error handling:
 
-    - If the subject cannot be identified from the access token and the optional `phoneNumber` field is not included in the request, then the server will return an error with the `422 MISSING_PHONE_NUMBER` error code.
-    - If the subject can be identified from the access token and the optional `phoneNumber` field is also included in the request, then the server will return an error with the `422 UNNECESSARY_PHONE_NUMBER` error code. This will the case even if the same phone number is identified by these two methods, as the server is unable to make this comparison.
+    - If the subject cannot be identified from the access token and the optional `phoneNumber` field is not included in the request, then the server will return an error with the `422 MISSING_IDENTIFIER` error code.
+    - If the subject can be identified from the access token and the optional `phoneNumber` field is also included in the request, then the server will return an error with the `422 UNNECESSARY_IDENTIFIER` error code. This will be the case even if the same phone number is identified by these two methods, as the server is unable to make this comparison.
 
 
   version: wip