diff --git a/base/doc/ltnews40.tex b/base/doc/ltnews40.tex
index 03b46b5ae..cbb04bcb4 100644
--- a/base/doc/ltnews40.tex
+++ b/base/doc/ltnews40.tex
@@ -237,7 +237,7 @@ \section{Thirty years of \LaTeXe{}}
 
 \section{News from the \enquote{\LaTeX{} Tagged PDF} project}
 
-\subsection{Engine support: An important update}
+\subsection{Engine support:\ An important update}
 
 As detailed below, work is progressing on the Tagged PDF
 project. There are many drivers for this work, including legal changes