diff --git a/runtime/doc/if_ruby.txt b/runtime/doc/if_ruby.txt
index 4084181..0d41d8f 100644
--- a/runtime/doc/if_ruby.txt
+++ b/runtime/doc/if_ruby.txt
@@ -1,4 +1,4 @@
-*if_ruby.txt*   For Vim version 7.4.  Last change: 2015 Feb 22
+*if_ruby.txt*   For Vim version 7.4.  Last change: 2015 Oct 16
 
 
 		  VIM REFERENCE MANUAL    by Shugo Maeda
@@ -199,6 +199,8 @@
 when needed.  When you don't use the Ruby interface you don't need it, thus
 you can use Vim even though this library file is not on your system.
 
+MS-Windows ~
+
 You need to install the right version of Ruby for this to work.  You can find
 the package to download from:
 http://www.garbagecollect.jp/ruby/mswin32/en/download/release.html
@@ -216,5 +218,12 @@
 You may also need to rename the include directory name to match the version,
 strangely for Ruby 1.9.3 the directory is called 1.9.1.
 
+Unix ~
+
+The 'rubydll' option can be used to specify the Ruby shared library file
+instead of DYNAMIC_RUBY_DLL file what was specified at compile time.  The
+version of the shared library must match the Ruby version Vim was compiled
+with.
+
 ==============================================================================
  vim:tw=78:ts=8:ft=help:norl: