diff --git a/lib/rubygems/specification.rb b/lib/rubygems/specification.rb
index 96e05a54b6..38986d5633 100644
--- a/lib/rubygems/specification.rb
+++ b/lib/rubygems/specification.rb
@@ -1914,6 +1914,7 @@ class Gem::Specification < Gem::BasicSpecification
 
   ##
   # Work around old bundler versions removing my methods
+  # Can be removed once RubyGems can no longer install Bundler 2.5
 
   def gem_dir # :nodoc:
     super