Add more details

source/_docs/tools/check_config.markdown

@@ -15,3 +15,23 @@ Test any changes to your `configuration.yaml` file before launching Home Assista
 $ hass --script check_config
 ```
 
+The script has further options like checking configuration files which are not located in the default directory or showing your secrets for debugging.
+
+```bash
+$ hass --script check_config -h
+usage: hass [-h] [--script {check_config}] [-c CONFIG] [-i [INFO]] [-f] [-s]
+
+Check Home Assistant configuration.
+
+optional arguments:
+  -h, --help            show this help message and exit
+  --script {check_config}
+  -c CONFIG, --config CONFIG
+                        Directory that contains the Home Assistant
+                        configuration
+  -i [INFO], --info [INFO]
+                        Show a portion of the config
+  -f, --files           Show used configuration files
+  -s, --secrets         Show secret information
+```
+