diff --git a/Formula/git-now.rb b/Formula/git-now.rb
index 37ae7bb428..e12ac5f70d 100644
--- a/Formula/git-now.rb
+++ b/Formula/git-now.rb
@@ -9,9 +9,7 @@ class GitNow < Formula
   depends_on 'gnu-getopt'
 
   def options
-    [
-      ['--zsh-completion', "copy zsh completion function file to #{share}/zsh/functions"]
-    ]
+    [['--zsh-completion', "Install zsh completions."]]
   end
 
   def patches
@@ -26,6 +24,12 @@ class GitNow < Formula
     end
   end
 
+  def caveats; <<-EOS
+    If `--zsh-completion` is specified, zsh completions are installed to:
+      #{share}/zsh/functions
+    EOS
+  end
+
 end
 
 # This patch makes sure GNUtools are used on OSX.