diff --git a/cli/src/generate/grammar-schema.json b/cli/src/generate/grammar-schema.json
index f6f2a4c0..59aa209c 100644
--- a/cli/src/generate/grammar-schema.json
+++ b/cli/src/generate/grammar-schema.json
@@ -115,7 +115,8 @@
           "type": "string",
           "pattern": "^PATTERN$"
         },
-        "value": { "type": "string" }
+        "value": { "type": "string" },
+        "flags": { "type": "string" }
       },
       "required": ["type", "value"]
     },