diff --git a/README.md b/README.md
index db7b81dd..3d9d7eeb 100644
--- a/README.md
+++ b/README.md
@@ -124,6 +124,8 @@ with:
   node-version: 16
 ```
 
+If the runner is not able to access github.com, any Nodejs versions requested during a workflow run must come from the runner's tool cache. See "[Setting up the tool cache on self-hosted runners without internet access](https://docs.github.com/en/enterprise-server@3.2/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access)" for more information.
+
 ## Advanced usage
 
 1. [Check latest version](docs/advanced-usage.md#check-latest-version)