Mime::Type.register documentation needs example

# $RAILS_ROOT/config/mime_types.rb Mime::Type.register "image/jpg", :jpg, ["image/jpeg", "image/pjpeg"]

Above example uses mime type synonyms. Each synonym is a alternative string used to identify the same mime type and appears as an array after the mime type symbol.

The class document does not explain the meaning of mime_type_synonyms nor give an example. Someone should fix that.

Hope this post clarifies use of mime type synonyms.