diff -r 7f115e5c5de4 -r bcba1d67f854 doc-src/TutorialI/preface.tex
--- a/doc-src/TutorialI/preface.tex	Mon Dec 15 16:38:25 2003 +0100
+++ b/doc-src/TutorialI/preface.tex	Mon Dec 15 17:08:41 2003 +0100
@@ -50,7 +50,7 @@
 Isabelle's \hfootref{http://isabelle.in.tum.de/}{web site} contains links to
 the download area and to documentation and other information.  Most Isabelle
 sessions are now run from within David Aspinall's\index{Aspinall, David}
-wonderful user interface, \hfootref{http://www.proofgeneral.org/}{Proof
+wonderful user interface, \hfootref{http://proofgeneral.inf.ed.ac.uk/}{Proof
   General}, even together with the
 \hfootref{http://x-symbol.sourceforge.net}{X-Symbol} package for XEmacs.  This
 book says very little about Proof General, which has its own documentation.