Fix markup for tilde in URL.
diff --git a/Doc/mac/using.tex b/Doc/mac/using.tex
index 47df26e..eaf2516 100644
--- a/Doc/mac/using.tex
+++ b/Doc/mac/using.tex
@@ -13,7 +13,7 @@
The most recent release version as well as possible newer experimental
versions are best found at the MacPython page maintained by Jack
-Jansen: \url{http://www.cwi.nl/~jack/macpython.html}.
+Jansen: \url{http://www.cwi.nl/\textasciitilde jack/macpython.html}.
Please refer to the \file{README} included with your distribution for