README.md in mkv2m4v-1.0.0 vs README.md in mkv2m4v-1.1.0

@@ -32,9 +32,16 @@
 ```bash
 # ffmpeg should already be installed, but just in case:
 $ brew install ffmpeg --with-tools
 ```
 
+If you have any trouble after installing the mkdv2m4v gem, you can test the
+dependencies using the `--check` argument:
+
+```bash
+$ mkv2m4v --check
+```
+
 ## Usage
 
 ```bash
 $ mkv2m4v some-video.mkv
 ```