diff --git a/doc/maintainers.md b/doc/maintainers.md
index e879034209..1a3f5ec2fb 100644
--- a/doc/maintainers.md
+++ b/doc/maintainers.md
@@ -154,11 +154,6 @@ have commit right, others don't.
 * https://github.com/ruby/forwardable
 * https://rubygems.org/gems/forwardable
 
-#### lib/getoptlong.rb
-* *unmaintained*
-* https://github.com/ruby/getoptlong
-* https://rubygems.org/gems/getoptlong
-
 #### lib/ipaddr.rb
 * Akinori MUSHA (knu)
 * https://github.com/ruby/ipaddr
@@ -485,6 +480,8 @@ have commit right, others don't.
 #### mutex_m
 * https://github.com/ruby/mutex_m
 
+#### lib/getoptlong.rb
+* https://github.com/ruby/getoptlong
 
 ## Platform Maintainers
 ### mswin64 (Microsoft Windows)
diff --git a/doc/standard_library.rdoc b/doc/standard_library.rdoc
index d0a7ba4207..7c102372d7 100644
--- a/doc/standard_library.rdoc
+++ b/doc/standard_library.rdoc
@@ -48,7 +48,6 @@ ErrorHighlight:: Highlight error location in your code
 FileUtils:: Several file utility methods for copying, moving, removing, etc
 Find:: This module supports top-down traversal of a set of file paths
 Forwardable:: Provides delegation of specified methods to a designated object
-GetoptLong:: Parse command line options similar to the GNU C getopt_long()
 IPAddr:: Provides methods to manipulate IPv4 and IPv6 IP addresses
 IRB:: Interactive Ruby command-line tool for REPL (Read Eval Print Loop)
 OptionParser:: Ruby-oriented class for command-line option analysis
@@ -130,3 +129,4 @@ TypeProf:: A type analysis tool for Ruby code based on abstract interpretation
 DEBUGGER__:: Debugging functionality for Ruby
 Racc:: A LALR(1) parser generator written in Ruby.
 Mutex_m:: Mixin to extend objects to be handled like a Mutex
+GetoptLong:: Parse command line options similar to the GNU C getopt_long()