README.textile in rmagick-2.15.4 vs README.textile in rmagick-2.16.0

@@ -34,10 +34,12 @@
 
 On Ubuntu, you can run:
 
 bc. sudo apt-get install libmagickwand-dev
 
+*Note to Windows users:* Please make sure that you choose an ImageMagick version that matches the bitness of your Ruby version.
+
 h2(#install). Installing RMagick
 
 h4. Installing via Bundler
 
 Add to your `Gemfile`:
@@ -51,9 +53,17 @@
 h4. Installing via RubyGems
 
 Run:
 
 bc. gem install rmagick
+
+h4. Versioning
+
+RMagick is versioned according to Semantic Versioning.
+For stable version compatible with Ruby 1.8+, use `~> 2.0`.
+Upcoming version 3 will work on Ruby 2.x only.
+
+h2(#usage). Using RMagick
 
 Require RMagick in your project as follows:
 
 bc. require 'rmagick'