diff --git a/Library/Homebrew/cli/args.rb b/Library/Homebrew/cli/args.rb
index aea8c1e43e..ea688f09f3 100644
--- a/Library/Homebrew/cli/args.rb
+++ b/Library/Homebrew/cli/args.rb
@@ -8,7 +8,13 @@ module Homebrew
     class Args < OpenStruct
       # FIXME: Enable cop again when https://github.com/sorbet/sorbet/issues/3532 is fixed.
       # rubocop:disable Style/MutableConstant
-      OptionsType = T.type_alias { T::Array[[String, T.nilable(String), T.nilable(String), String, T::Boolean]] }
+      # Represents a processed option. The array elements are:
+      #   0: short option name (e.g. "-d")
+      #   1: long option name (e.g. "--debug")
+      #   2: ???
+      #   3: option description (e.g. "Print debugging information")
+      #   4: whether the option is hidden)
+      OptionsType = T.type_alias { T::Array[[String, T.nilable(String), NilClass, String, T::Boolean]] }
       # rubocop:enable Style/MutableConstant
 
       sig { returns(T::Array[String]) }