README.md in rails_external_assets-0.5.0 vs README.md in rails_external_assets-0.6.0

@@ -144,9 +144,15 @@
 
 Note that in a Rails environment, `assets:clobber` will also remove all the files in your `base_path` directory (where your assets are built).
 
 > Defaults to `echo "You did not define a build script"`
 
+**cache_manifest**
+
+This is specifies whether the manifest should be cached. This should probably be false for development and true in production.
+
+> Defaults to `true`
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. 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).