README.md in bundler-grep-0.1.0 vs README.md in bundler-grep-0.2.0

@@ -29,9 +29,15 @@
 
 ```sh
 $ BUNDLER_GREP_CMD='hw' bundle grep KEYWORD
 ```
 
+If you want to grep specific gems, you can use `--gems` option.
+
+```sh
+$ bundle grep --gems gem_name1,gem_name2 KEYWORD
+```
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
 
 To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).