1 files changed, 16 insertions, 0 deletions
diff --git a/lib/rubygems/version_option.rb b/lib/rubygems/version_option.rb
index a69b732f78..a3de4dc9e7 100644
--- a/lib/rubygems/version_option.rb
+++ b/lib/rubygems/version_option.rb
@@ -6,10 +6,14 @@
 
 require 'rubygems'
 
+##
 # Mixin methods for --version and --platform Gem::Command options.
+
 module Gem::VersionOption
 
+  ##
   # Add the --platform option to the option parser.
+
   def add_platform_option(task = command, *wrap)
     OptionParser.accept Gem::Platform do |value|
       if value == Gem::Platform::RUBY then
@@ -31,7 +35,19 @@ module Gem::VersionOption
     end
   end
 
+  ##
+  # Add the --prerelease option to the option parser.
+
+  def add_prerelease_option(*wrap)
+    add_option("--[no-]prerelease",
+               "Allow prerelease versions of a gem", *wrap) do |value, options|
+      options[:prerelease] = value
+    end
+  end
+
+  ##
   # Add the --version option to the option parser.
+
   def add_version_option(task = command, *wrap)
     OptionParser.accept Gem::Requirement do |value|
       Gem::Requirement.new value