diff --git a/code/API_definitions/location-verification.yaml b/code/API_definitions/location-verification.yaml
index c4cac01..2205b8c 100644
--- a/code/API_definitions/location-verification.yaml
+++ b/code/API_definitions/location-verification.yaml
@@ -223,11 +223,13 @@ components:
       description: Correlation id for the different services
       schema:
         type: string
+        pattern: ^[a-zA-Z0-9-]{0,55}$
   headers:
     x-correlator:
       description: Correlation id for the different services
       schema:
         type: string
+        pattern: ^[a-zA-Z0-9-]{0,55}$
   schemas:
     Area:
       description: Base schema for all areas
@@ -683,10 +685,10 @@ components:
               value:
                 status: 429
                 code: QUOTA_EXCEEDED
-                message: Either out of resource quota or reaching rate limiting.
+                message: Out of resource quota.
             GENERIC_429_TOO_MANY_REQUESTS:
-              description: API Server request limit is overpassed
+              description: Access to the API has been temporarily blocked due to rate or spike arrest limits being reached
               value:
                 status: 429
                 code: TOO_MANY_REQUESTS
-                message: Either out of resource quota or reaching rate limiting.
+                message: Rate limit reached.