diff -r c8b5dcacf2e3 -r d6fc3c4423f7 doc-src/IsarRef/isar-ref.tex
--- a/doc-src/IsarRef/isar-ref.tex	Tue Sep 07 18:09:04 1999 +0200
+++ b/doc-src/IsarRef/isar-ref.tex	Tue Sep 07 18:09:18 1999 +0200
@@ -2,7 +2,7 @@
 %% $Id$
 
 \documentclass[12pt,fleqn]{report}
-\usepackage{graphicx,a4,../iman,../extra,../proof,../rail,../railsetup,../isar,../pdfsetup}
+\usepackage{graphicx,a4,../url,../iman,../extra,../proof,../rail,../railsetup,../isar,../pdfsetup}
 
 \title{\includegraphics[scale=0.5]{isabelle_isar} \\[4ex] The Isabelle/Isar Reference Manual}
 \author{\emph{Markus Wenzel} \\ TU M\"unchen}