README.md in tdiff-0.3.2 vs README.md in tdiff-0.3.3

@@ -1,9 +1,9 @@
 # TDiff
 
-* [Source](http://github.com/postmodern/tdiff)
-* [Issues](http://github.com/postmodern/tdiff/issues)
+* [Source](https://github.com/postmodern/tdiff)
+* [Issues](https://github.com/postmodern/tdiff/issues)
 * Postmodern (postmodern.mod3 at gmail.com)
 
 ## Description
 
 Calculates the differences between two tree-like structures. Similar to
@@ -62,9 +62,13 @@
                                   /html/body/div
       <p>three</p>                /html/body/div
     - one                         /html/body/div/p[1]
     + two                         /html/body/div/p[2]
       three                       /html/body/div/p[2]
+
+## Requirements
+
+* [ruby](http://www.ruby-lang.org/) >= 1.8.7
 
 ## Install
 
     $ gem install tdiff