diff --git a/README.md b/README.md
index 2125eda..a458be0 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,14 @@ as:
 
 Use setup-forgejo from source.
 
+The [setup-forgejo](https://code.forgejo.org/actions/setup-forgejo)
+repository is a [Forgejo
+Action](https://forgejo.org/docs/v1.21/user/actions/) which is meant
+to be used in workflows. However, it is implemented as shell scripts that
+can also be used to create Forgejo instances and runners locally. This
+is convenient for testing and the reason why it needs to be added to the PATH.
+For instance, it is a dependency of the `actions/run.sh` script.
+
 ```sh
 git clone https://code.forgejo.org/actions/setup-forgejo
 export PATH=$(pwd)/setup-forgejo:$PATH