Clarify that --make paths are comma-separated

README.md

@@ -29,7 +29,7 @@ The script currently takes the following arguments:
 
 | argument | required | description |
 |:--------:|:--------:|:------------|
-| `--make` | yes | The path(s) to the files you want to bundle into a phar |
+| `--make` | yes | The comma-separated path(s) to the files you want to bundle into a phar |
 | `--relative` | no | Make DevTools resolve paths relative to the given path. If not specified, defaults to the current working directory. |
 | `--stub` | no | PHP file to use as a custom phar stub. The stub will be executed when the phar is run from the command line. |
 | `--out` | yes | Path and filename of the output phar file. |