diff --git a/packages/@aws-cdk/aws-lambda-python/README.md b/packages/@aws-cdk/aws-lambda-python/README.md
index af19fd7ca037f..6add43f02d141 100644
--- a/packages/@aws-cdk/aws-lambda-python/README.md
+++ b/packages/@aws-cdk/aws-lambda-python/README.md
@@ -172,6 +172,8 @@ new lambda.PythonFunction(this, 'function', {
 });
 ```
 
+The index URL or the token are only used during bundling and thus not included in the final asset.
+
 If you also want to use the Code Artifact repo for initializing the Docker image for bundling, use `buildArgs`:
 
 ```ts