diff --git a/index.md b/index.md
index cb9c9fe..f549779 100644
--- a/index.md
+++ b/index.md
@@ -340,8 +340,16 @@ droneci_autoscaler_restart_policy: always
 
 ### droneci_autoscaler_runner_env_file
 
+The file needs to be mounted to the runner **and** agent.
+
 #### Default value
 
+```YAML
+droneci_autoscaler_runner_env_file: _unset_
+```
+
+#### Example usage
+
 ```YAML
 droneci_autoscaler_runner_env_file: /etc/drone.conf
 ```