Dockerfile in switchery-rails-0.8.0 vs Dockerfile in switchery-rails-0.8.1

@@ -1,26 +1,10 @@
 # Switchery-rails gem Dockerfile
 #
 # How to use it
 # =============
 #
-# $ sudo docker build -t zedtux/switchery-rails .
-# $ sudo docker run -it zedtux/switchery-rails
-# rake build             # Build switchery-rails-0.1.0.gem into the pkg directory
-# rake install           # Build and install switchery-rails-0.1.0.gem into system gems
-# rake install:local     # Build and install switchery-rails-0.1.0.gem into system gems without network access
-# rake release           # Create tag v0.1.0 and build and push switchery-rails-0.1.0.gem to Rubygems
-# rake update_switchery  # Update the Switchery Javascript and CSS files
-#
-# Update the Switchery library
-# ----------------------------
-#
-# Update the file `lib/switchery/rails/version.rb` in order to set the Switchery version to download then:
-#
-# $ sudo docker run --rm -v `pwd`:/gem/ -it zedtux/switchery-rails rake update_switchery
-# Downlading Switchery 0.8.0 ...
-# Done!
-#
+# Visit http://blog.zedroot.org/using-docker-to-maintain-a-ruby-gem/
 
 # ~~~~ Image base ~~~~
 # Base image with the latest Ruby only
 FROM litaio/ruby:2.2.2
 MAINTAINER Guillaume Hain [e-mail]