Update docs

Author: overint

README.md

@@ -16,6 +16,8 @@ You can also override the default config provided by the application by running
 
 Generating the swagger documentation is easy, simply run `php artisan laravel-swagger:generate` in your project root. Keep in mind the command will simply print out the output in your console. If you want the docs saved in a file you can reroute the output like so: `php artisan laravel-swagger:generate > swagger.json`
 
+If you wish to generate docs for a subset of your routes, you can pass a filter using `--filter`, for example: `php artisan laravel-swagger:generate --filter="/api"`
+
 By default, laravel-swagger prints out the documentation in json format, if you want it in YAML format you can override the format using the `--format` flag. Make sure to have the yaml extension installed if you choose to do so.
 
 Format options are:<br>