diff --git a/lib/rubygems/commands/update_command.rb b/lib/rubygems/commands/update_command.rb
index a4227b8ca1..d9740d814a 100644
--- a/lib/rubygems/commands/update_command.rb
+++ b/lib/rubygems/commands/update_command.rb
@@ -317,9 +317,7 @@ command to remove old versions.
 
   #
   # Oldest version we support downgrading to. This is the version that
-  # originally ships with the first patch version of each ruby, because we never
-  # test each ruby against older rubygems, so we can't really guarantee it
-  # works. Version list can be checked here: https://stdgems.org/rubygems
+  # originally ships with the oldest supported patch version of ruby.
   #
   def oldest_supported_version
     @oldest_supported_version ||=