Hide `update` from `brew cask help`.

1 files changed, 5 insertions, 1 deletions

diff --git a/Library/Homebrew/compat/hbc/cli/update.rb b/Library/Homebrew/compat/hbc/cli/update.rb
index 80f961228..7820997cb 100644
--- a/Library/Homebrew/compat/hbc/cli/update.rb
+++ b/Library/Homebrew/compat/hbc/cli/update.rb
@@ -11,8 +11,12 @@ module Hbc
         exit result.exit_status
       end
 
+      def self.visible
+        false
+      end
+
       def self.help
-        Formatter.warning("deprecated: use `brew update` instead")
+        "a synonym for 'brew update'"
       end
     end
   end