diff --git a/packages/aws-cdk-lib/aws-kms/README.md b/packages/aws-cdk-lib/aws-kms/README.md
index b5a5786cc7225..a039288e468eb 100644
--- a/packages/aws-cdk-lib/aws-kms/README.md
+++ b/packages/aws-cdk-lib/aws-kms/README.md
@@ -77,7 +77,7 @@ import * as cloudtrail from 'aws-cdk-lib/aws-cloudtrail';
 const myKeyAlias = kms.Alias.fromAliasName(this, 'myKey', 'alias/aws/s3');
 const trail = new cloudtrail.Trail(this, 'myCloudTrail', {
   sendToCloudWatchLogs: true,
-  kmsKey: myKeyAlias,
+  encryptionKey: myKeyAlias,
 });
 ```