diff --git a/Doc/libmac.tex b/Doc/libmac.tex
index 965412f79e1..284c09c3609 100644
--- a/Doc/libmac.tex
+++ b/Doc/libmac.tex
@@ -1,3 +1,6 @@
+\section{Introduction}
+\label{intro}
+
 The modules in this manual are available on the Apple Macintosh only.
 
 Aside from the modules described here there are also interfaces to
diff --git a/Doc/mac/libmac.tex b/Doc/mac/libmac.tex
index 965412f79e1..284c09c3609 100644
--- a/Doc/mac/libmac.tex
+++ b/Doc/mac/libmac.tex
@@ -1,3 +1,6 @@
+\section{Introduction}
+\label{intro}
+
 The modules in this manual are available on the Apple Macintosh only.
 
 Aside from the modules described here there are also interfaces to