diff --git a/packages/@aws-cdk/aws-lambda-nodejs/test/docker.test.ts b/packages/@aws-cdk/aws-lambda-nodejs/test/docker.test.ts
index b1d7690553e32..dfb8d07b0fb4a 100644
--- a/packages/@aws-cdk/aws-lambda-nodejs/test/docker.test.ts
+++ b/packages/@aws-cdk/aws-lambda-nodejs/test/docker.test.ts
@@ -15,6 +15,9 @@ test('parcel is available', async () => {
 });
 
 test('parcel is installed without a package-lock.json file', async () => {
+  // We don't want a lock file at / to prevent Parcel from considering that /asset-input
+  // is part of a monorepo.
+  // See https://github.com/aws/aws-cdk/pull/10039#issuecomment-682738396
   const proc = spawnSync('docker', [
     'run', 'parcel',
     'sh', '-c',