diff --git a/readme.md b/readme.md
index db112661..73440a67 100644
--- a/readme.md
+++ b/readme.md
@@ -893,6 +893,9 @@ GitHub Readme Stats provides several environment variables that can be used to c
 
 See [the Vercel documentation](https://vercel.com/docs/concepts/projects/environment-variables) on adding these environment variables to your Vercel instance.
 
+> [!WARNING]\
+> Please remember to redeploy your instance after making any changes to the environment variables so that the updates take effect. The changes will not be applied to the previous deployments.
+
 ## Keep your fork up to date
 
 You can keep your fork, and thus your private Vercel instance up to date with the upstream using GitHub's [Sync Fork button](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork). You can also use the [pull](https://github.com/wei/pull) package created by [@wei](https://github.com/wei) to automate this process.