diff --git a/Library/Homebrew/dev-cmd/ruby.rb b/Library/Homebrew/dev-cmd/ruby.rb
index ee0ddf6410..c353921188 100644
--- a/Library/Homebrew/dev-cmd/ruby.rb
+++ b/Library/Homebrew/dev-cmd/ruby.rb
@@ -15,6 +15,8 @@ module Homebrew
       description <<~EOS
         Run a Ruby instance with Homebrew's libraries loaded. For example,
         `brew ruby -e "puts :gcc.f.deps"` or `brew ruby script.rb`.
+
+        Run e.g. `brew ruby -- --version` to pass arbitrary arguments to `ruby`.
       EOS
       flag "-r=",
            description: "Load a library using `require`."