diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/cat.snapshots.json b/rest-api-spec/src/main/resources/rest-api-spec/api/cat.snapshots.json
index b54bee38c24..68468dd542a 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/cat.snapshots.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/cat.snapshots.json
@@ -8,6 +8,7 @@
       "parts": {
         "repository": {
           "type" : "list",
+          "required": true,
           "description": "Name of repository from which to fetch the snapshot information"
         }
       },