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diff --git a/ReleaseNote.txt b/ReleaseNote.txt
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--- a/ReleaseNote.txt
+++ b/ReleaseNote.txt
@@ -1,3 +1,70 @@
+$ [ANN] Erubis 2.4.0 released - a fast eRuby implementation
+
+Erubis 2.4.0 released.
+http://www.kuwata-lab.com/erubis/
+In this release, Erubis provides important feature for Ruby on Rails
+application.
+
+Enhancements:
+
+    - |
+      Preprocessing is supported by Ruby on Rails helper.
+      Preprocessing makes Ruby on Rails application about 20-40 percent faster.
+
+      For example,
+
+         [%= link_to 'Show', :action=>'show', :id=_?('@user.id') %]
+
+      is evaluate by preprocessor and expanded into the following
+      when template file is loaded.
+
+         <a href="/users/show/<%=@user.id%>">Show</a>
+
+      It means that link_to() is never called when template is rendered
+      and rendering speed will be much faster in the result.
+
+      See User's Guide for details.
+      http://www.kuwata-lab.com/erubis/users-guide.05.html#rails-preprocessing
+
+    - |
+      Erubis::Eruby#evaluate() (or Erubis::RubyEvaluator#evaluate())
+      creates Proc object from @src and eval it.
+
+        def evaluate(context=Context.new)
+          context = Context.new(context) if context.is_a?(Hash)
+          @_proc ||= eval("proc { #{@src} }", TOPLEVEL_BINDING, @filename || '(erubis)')
+          return context.instance_eval(&@_proc)
+        end
+
+      This makes evaluate() much faster when eruby object is reused.
+      
+    - |
+      Erubis::Eruby#def_method() is supported.
+      This method defines ruby code as module's instance method.
+
+        def def_method(module_object, method_name, filename=nil)
+          module_object.module_eval("def #{method_name}; #{@src}; end", filename || @filename)
+        end
+
+      This is equivarent to ERB#def_method().
+
+    - |
+      Erubis::XmlHelper.url_escape() and u() which is alias of url_escape()
+      are added.
+      This is equivarent to ERB#Util.url_escape().
+
+
+Bugfix:
+
+    - Help message was not shown when '-h' is specified. Fixed.
+
+    - 'def method()' was not availabe in template file. Fixed.
+
+
+
+
+--------------------------------------------------------------------------------
+
 $ [ANN] Erubis 2.3.1 released - a serious bug is fixed in rails_helper.rb
 
 Erubis 2.3.1 released.