diff -r 52cb0e965041 -r 9b4aec46ad78 doc-src/IsarRef/isar-ref.tex
--- a/doc-src/IsarRef/isar-ref.tex	Thu May 08 22:17:37 2008 +0200
+++ b/doc-src/IsarRef/isar-ref.tex	Thu May 08 22:20:33 2008 +0200
@@ -4,6 +4,7 @@
 \documentclass[12pt,a4paper,fleqn]{report}
 \usepackage{latexsym,graphicx}
 \usepackage{../iman,../extra,../isar,../proof}
+\usepackage[nohyphen,strings]{underscore}
 \usepackage{Thy/document/isabelle,Thy/document/isabellesym}
 \usepackage{../ttbox,,../rail,../railsetup}
 \usepackage{style}
@@ -71,8 +72,6 @@
 
 \begin{document}
 
-\underscoreoff
-
 \maketitle 
 
 \pagenumbering{roman} \tableofcontents \clearfirst