diff --git a/lib/irb/irb.gemspec b/lib/irb/irb.gemspec
index b29002f5931df7..6057d84dbb0968 100644
--- a/lib/irb/irb.gemspec
+++ b/lib/irb/irb.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage
-  spec.metadata["documentation_uri"] = spec.homepage
+  spec.metadata["documentation_uri"] = "https://ruby.github.io/irb/"
   spec.metadata["changelog_uri"] = "#{spec.homepage}/releases"
 
   spec.files         = [