diff --git a/specification/validated-relationships-service-api.yaml b/specification/validated-relationships-service-api.yaml
index b482826..03f6438 100644
--- a/specification/validated-relationships-service-api.yaml
+++ b/specification/validated-relationships-service-api.yaml
@@ -180,8 +180,8 @@ paths:
               examples:
                 postQuestionnaireResponseSuccess:
                   $ref: '#/components/examples/PostQuestionnaireResponseSuccess'
-        '400':
-          description: Bad request
+        '4XX':
+          description: Client errors
           content:
             application/fhir+json:
               schema: