--- a/tests/src/xcm/xcmUnique.test.ts
+++ b/tests/src/xcm/xcmUnique.test.ts
@@ -834,7 +834,11 @@
     await usingPolkadexPlaygrounds(polkadexUrl, async (helper) => {
       const isWhitelisted = ((await helper.callRpc('api.query.xcmHelper.whitelistedTokens', [])).toJSON() as [])
         .map(nToBigInt).length != 0;
-
+      /*
+      Check whether the Unique token has been added
+      to the whitelist, since an error will occur
+      if it is added again.
+      */
       if(!isWhitelisted) {
         await helper.getSudo().xcmHelper.whitelistToken(alice, uniqueAssetId);
       }