diff -r eef9e422929a -r 7ef380745743 doc-src/TutorialI/CTL/document/CTL.tex
--- a/doc-src/TutorialI/CTL/document/CTL.tex	Sat Nov 04 18:44:34 2000 +0100
+++ b/doc-src/TutorialI/CTL/document/CTL.tex	Sat Nov 04 18:54:22 2000 +0100
@@ -2,7 +2,8 @@
 \begin{isabellebody}%
 \def\isabellecontext{CTL}%
 %
-\isamarkupsubsection{Computation tree logic---CTL}
+\isamarkupsubsection{Computation tree logic---CTL%
+}
 %
 \begin{isamarkuptext}%
 \label{sec:CTL}