diff --git a/packages/@aws-cdk/aws-lambda/README.md b/packages/@aws-cdk/aws-lambda/README.md
index 223f94bdd0a3a..a60ca0143d7f0 100644
--- a/packages/@aws-cdk/aws-lambda/README.md
+++ b/packages/@aws-cdk/aws-lambda/README.md
@@ -56,7 +56,8 @@ functions will use an autogenerated Role if one is not provided.
 
 The autogenerated Role is automatically given permissions to execute the Lambda
 function. To reference the autogenerated Role:
-```
+
+```ts
 const fn = new lambda.Function(this, 'MyFunction', {
   runtime: lambda.Runtime.NODEJS_10_X,
   handler: 'index.handler',