Fix some broken URLs.
diff --git a/Doc/using/mac.rst b/Doc/using/mac.rst
index 5b14b1c..18bfb82 100644
--- a/Doc/using/mac.rst
+++ b/Doc/using/mac.rst
@@ -74,7 +74,7 @@
http://www.barebones.com/products/bbedit/index.shtml) are good choices, as is
:program:`TextMate` (see http://macromates.com/). Other editors include
:program:`Gvim` (http://macvim.org) and :program:`Aquamacs`
-(http://aquamacs.org).
+(http://aquamacs.org/).
To run your script from the Terminal window you must make sure that
:file:`/usr/local/bin` is in your shell search path.