diff --git a/examples/basic/04_SystemMonitor/README.md b/examples/basic/04_SystemMonitor/README.md
index 5d690c4..bb73d52 100644
--- a/examples/basic/04_SystemMonitor/README.md
+++ b/examples/basic/04_SystemMonitor/README.md
@@ -13,6 +13,8 @@ $ kapow server SystemMonitor.pow
 
 <details><summary>List files and directories</summary>
 
+You can see if a file exists or the contents of a directory adding the path after _/file/_.
+
 ```
 $ curl -s http://localhost:8080/file/var/log/cups
 total 60