Add a bit more explanation at the end

jbranchaud · jbranchaud · commit ffa8e3508544 · 2016-06-07T20:20:50.000-05:00
diff --git a/unix/globbing-for-filenames-in-zsh.md b/unix/globbing-for-filenames-in-zsh.md
@@ -23,6 +23,8 @@ $ ls *[0-9]
 10  11  2   3   4   801 92
 ```
 
+This only scrapes the surface of what can be done with globbing in Zsh.
+
 [source](http://zsh.sourceforge.net/Intro/intro_2.html)
 
 h/t Josh Davey
