diff --git a/packages/aws-cdk-lib/assertions/README.md b/packages/aws-cdk-lib/assertions/README.md
index 8208c98f3918a..8a20ae731ba96 100644
--- a/packages/aws-cdk-lib/assertions/README.md
+++ b/packages/aws-cdk-lib/assertions/README.md
@@ -2,7 +2,7 @@
 
 
 If you're migrating from the old `assert` library, the migration guide can be found in
-[our GitHub repository](https://github.com/aws/aws-cdk/blob/main/packages/@aws-cdk/assertions/MIGRATING.md).
+[our GitHub repository](https://github.com/aws/aws-cdk/blob/v1-main/packages/@aws-cdk/assertions/MIGRATING.md).
 
 Functions for writing test asserting against CDK applications, with focus on CloudFormation templates.