diff --git a/Library/Contributions/brew_zsh_completion.zsh b/Library/Contributions/brew_zsh_completion.zsh
index 57c1f4ed51..7ca77ebf87 100644
--- a/Library/Contributions/brew_zsh_completion.zsh
+++ b/Library/Contributions/brew_zsh_completion.zsh
@@ -39,8 +39,10 @@ _1st_arguments=(
   'remove:remove a formula'
   'search:search for a formula (/regex/ or string)'
   'server:start a local web app that lets you browse formulae (requires Sinatra)'
+  'tap:tap a new formula repository from GitHub, or list existing taps'
   'unlink:unlink a formula'
   'unpin:unpin specified formulae'
+  'untap:remove a tapped repository'
   'update:freshen up links'
   'upgrade:upgrade outdated formulae'
   'uses:show formulae which depend on a formula'