diff --git a/packaging_apps.md b/packaging_apps.md
index 3f966470..93884eca 100644
--- a/packaging_apps.md
+++ b/packaging_apps.md
@@ -129,6 +129,17 @@ Since YunoHost has a unified architecture, you will be able to guess most of the
### Helpers
The CLI [moulinette](#/moulinette) provides a few tools to make the packager's work easier:
+
+
+```bash
+sudo yunohost app checkport
+```
+
+This helper checks the port and return an error if the port is already in use.
+
+
+
+
```bash
sudo yunohost app setting [ -v ]
```