diff --git a/doc/maintainers.rdoc b/doc/maintainers.rdoc
index e580e4e079..2f1cbe914e 100644
--- a/doc/maintainers.rdoc
+++ b/doc/maintainers.rdoc
@@ -118,8 +118,6 @@ Zachary Scott (zzak)
   Tanaka Akira (akr)
 [lib/resolv.rb]
   Tanaka Akira (akr)
-[lib/rexml/*]
-  Kouhei Sutou (kou)
 [lib/rinda/*]
   Masatoshi SEKI (seki)
 [lib/rubygems.rb, lib/ubygems.rb, lib/rubygems/*]
@@ -218,6 +216,8 @@ Zachary Scott (zzak)
 [lib/rdoc.rb, lib/rdoc/*]
   Eric Hodel (drbrain), Hiroshi SHIBATA (hsbt)
   https://github.com/ruby/rdoc
+[lib/rexml/*]
+  Kouhei Sutou (kou)
 [lib/rss.rb, lib/rss/*]
   Kouhei Sutou (kou)
 [lib/scanf.rb]
diff --git a/doc/standard_library.rdoc b/doc/standard_library.rdoc
index aa077e210e..db06110de0 100644
--- a/doc/standard_library.rdoc
+++ b/doc/standard_library.rdoc
@@ -50,7 +50,6 @@ Racc:: A LALR(1) parser generator written in Ruby.
 RbConfig:: Information of your configure and build of Ruby
 resolv-replace.rb:: Replace Socket DNS with Resolv
 Resolv::  Thread-aware DNS resolver library in Ruby
-REXML:: An XML toolkit for Ruby
 Rinda:: The Linda distributed computing paradigm in Ruby
 Gem:: Package management framework for Ruby
 SecureRandom:: Interface for secure random number generator
@@ -95,6 +94,7 @@ CMath:: Provides Trigonometric and Transcendental functions for complex numbers
 CSV:: Provides an interface to read and write CSV files and data
 FileUtils:: Several file utility methods for copying, moving, removing, etc
 RDoc:: Produces HTML and command-line documentation for Ruby
+REXML:: An XML toolkit for Ruby
 RSS:: Family of libraries that support various formats of XML "feeds"
 Scanf:: A Ruby implementation of the C function scanf(3)
 WEBrick:: An HTTP server toolkit for Ruby
diff --git a/lib/rexml/rexml.gemspec b/lib/rexml/rexml.gemspec
new file mode 100644
index 0000000000..e31861c671
--- /dev/null
+++ b/lib/rexml/rexml.gemspec
@@ -0,0 +1,37 @@
+require_relative "rexml/rexml"
+
+Gem::Specification.new do |spec|
+  spec.name          = "rexml"
+  spec.version       = REXML::VERSION
+  spec.authors       = ["Kouhei Sutou"]
+  spec.email         = ["kou@cozmixng.org"]
+
+  spec.summary       = %q{An XML toolkit for Ruby}
+  spec.description   = %q{An XML toolkit for Ruby}
+  spec.homepage      = "https://github.com/ruby/rexml"
+  spec.license       = "BSD-2-Clause"
+
+  spec.files         = [".gitignore", ".travis.yml", "Gemfile", "LICENSE.txt", "README.md", "Rakefile",
+  "bin/console", "bin/setup", "lib/rexml/attlistdecl.rb", "lib/rexml/attribute.rb", "lib/rexml/cdata.rb",
+  "lib/rexml/child.rb", "lib/rexml/comment.rb", "lib/rexml/doctype.rb", "lib/rexml/document.rb",
+  "lib/rexml/dtd/attlistdecl.rb", "lib/rexml/dtd/dtd.rb", "lib/rexml/dtd/elementdecl.rb",
+  "lib/rexml/dtd/entitydecl.rb", "lib/rexml/dtd/notationdecl.rb", "lib/rexml/element.rb",
+  "lib/rexml/encoding.rb", "lib/rexml/entity.rb", "lib/rexml/formatters/default.rb",
+  "lib/rexml/formatters/pretty.rb", "lib/rexml/formatters/transitive.rb", "lib/rexml/functions.rb",
+  "lib/rexml/instruction.rb", "lib/rexml/light/node.rb", "lib/rexml/namespace.rb", "lib/rexml/node.rb",
+  "lib/rexml/output.rb", "lib/rexml/parent.rb", "lib/rexml/parseexception.rb", "lib/rexml/parsers/baseparser.rb",
+  "lib/rexml/parsers/lightparser.rb", "lib/rexml/parsers/pullparser.rb", "lib/rexml/parsers/sax2parser.rb",
+  "lib/rexml/parsers/streamparser.rb", "lib/rexml/parsers/treeparser.rb",
+  "lib/rexml/parsers/ultralightparser.rb", "lib/rexml/parsers/xpathparser.rb", "lib/rexml/quickpath.rb",
+  "lib/rexml/rexml.rb", "lib/rexml/sax2listener.rb", "lib/rexml/security.rb", "lib/rexml/source.rb",
+  "lib/rexml/streamlistener.rb", "lib/rexml/syncenumerator.rb", "lib/rexml/text.rb",
+  "lib/rexml/undefinednamespaceexception.rb", "lib/rexml/validation/relaxng.rb",
+  "lib/rexml/validation/validation.rb", "lib/rexml/validation/validationexception.rb", "lib/rexml/xmldecl.rb",
+  "lib/rexml/xmltokens.rb", "lib/rexml/xpath.rb", "lib/rexml/xpath_parser.rb", "rexml.gemspec"]
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler"
+  spec.add_development_dependency "rake"
+end