New style section headers.
diff --git a/Doc/mac/libmacos.tex b/Doc/mac/libmacos.tex
index 7aa4104..8f21981 100644
--- a/Doc/mac/libmacos.tex
+++ b/Doc/mac/libmacos.tex
@@ -1,4 +1,5 @@
-\section{Built-in Module \module{MacOS}}
+\section{\module{MacOS} ---
+         Access to MacOS specific interpreter features.}
 \declaremodule{builtin}{MacOS}
 
 \modulesynopsis{Access to MacOS specific interpreter features.}