diff --git a/ruby-1.8.6-p369-ri-gem_multipath.patch b/ruby-1.8.6-p369-ri-gem_multipath.patch
new file mode 100644
index 0000000..be66fad
--- /dev/null
+++ b/ruby-1.8.6-p369-ri-gem_multipath.patch
@@ -0,0 +1,55 @@
+--- ruby-1.8.6-p369/lib/rdoc/ri/ri_options.rb.gemmulti	2007-02-13 08:01:19.000000000 +0900
++++ ruby-1.8.6-p369/lib/rdoc/ri/ri_options.rb	2009-10-14 01:08:42.000000000 +0900
+@@ -63,7 +63,7 @@
+ 
+         [ "--gems",         nil,    nil,
+           "Include documentation from Rubygems:\n  " +
+-          (RI::Paths::GEMDIRS ? "#{Gem.path}/doc/*/ri" :
++          (RI::Paths::GEMDIRS ? ( tmppath=""; Gem.path.each {|path| tmppath += "#{path}/doc/*/ri "}; tmppath) :
+                                 "No Rubygems ri found.") ],
+                                                            
+         [ "--format",       "-f",   "<name>",
+@@ -136,7 +136,11 @@
+           RI::Paths::HOMEDIR
+         ]
+ 
+-        directories << "#{Gem.path}/doc/*/ri" if RI::Paths::GEMDIRS
++        if RI::Paths::GEMDIRS
++          Gem.path.each {|gempath|
++            directories << "#{gempath}/doc/*/ri"
++          }
++        end
+ 
+         directories = directories.join("\n    ")
+ 
+--- ruby-1.8.6-p369/lib/rdoc/ri/ri_paths.rb.gemmulti	2007-02-13 08:01:19.000000000 +0900
++++ ruby-1.8.6-p369/lib/rdoc/ri/ri_paths.rb	2009-10-13 19:58:07.000000000 +0900
+@@ -43,9 +43,14 @@
+     PATH = [ SYSDIR, SITEDIR, HOMEDIR ].find_all {|p| p && File.directory?(p)}
+ 
+     begin
+-      require 'rubygems'
+-      GEMDIRS = Dir["#{Gem.path}/doc/*/ri"]
+-      GEMDIRS.each { |path| RI::Paths::PATH << path }
++      require 'rubygems'  
++      gemdirs = []
++      Gem.path.each{ |gempath| 
++         ripath = Dir["#{gempath}/doc/*/ri"]
++         ripath.each { |path| RI::Paths::PATH << path }
++         gemdirs << gempath
++      }
++      GEMDIRS = gemdirs
+     rescue LoadError
+       GEMDIRS = nil
+     end
+@@ -71,7 +76,9 @@
+       path << RI::Paths::SYSDIR if use_system
+       path << RI::Paths::SITEDIR if use_site
+       path << RI::Paths::HOMEDIR if use_home
+-      path << RI::Paths::GEMDIRS if use_gems
++      if use_gems
++         RI::Paths::GEMDIRS.each {|gemdirs| path << gemdirs }
++      end
+ 
+       return path.flatten.compact
+     end
diff --git a/ruby.spec b/ruby.spec
index 5c70969..01297ea 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -16,7 +16,7 @@
 
 Name:		ruby
 Version:	%{rubyver}%{?dotpatchlevel}
-Release:	3%{?dist}
+Release:	4%{?dist}
 License:	Ruby or GPLv2
 URL:		http://www.ruby-lang.org/
 BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -50,6 +50,7 @@ Patch27:        ruby-1.8.6-p287-CVE-2008-5189.patch
 Patch28:        ruby-1.8.6-p287-remove-ssl-rand-range.patch
 Patch29:	ruby-always-use-i386.patch
 Patch30:	ruby-openssl-1.0.patch
+Patch31:	ruby-1.8.6-p369-ri-gem_multipath.patch
 
 Summary:	An interpreter of object-oriented scripting language
 Group:		Development/Languages
@@ -180,6 +181,7 @@ pushd %{name}-%{arcver}
 %patch28 -p1
 %patch29 -p1
 %patch30 -p2
+%patch31 -p1
 popd
 
 %build
@@ -546,6 +548,10 @@ rm -rf $RPM_BUILD_ROOT
 %{_emacs_sitestartdir}/ruby-mode-init.el
 
 %changelog
+* Wed Oct 14 2009 Mamoru Tasaka <mtasaka@ioa.s.u-tokyo.ac.jp> - 1.8.6.369-4
+- Fix the search path of ri command for ri manuals installed with gem
+  (bug 528787)
+
 * Wed Aug 26 2009 Tomas Mraz <tmraz@redhat.com> - 1.8.6.369-3
 - Rebuild against new openssl