1 files changed, 3 insertions, 1 deletions
diff --git a/appendixa/m4.xml b/appendixa/m4.xml
index 670ff81e6..0e2263837 100644
--- a/appendixa/m4.xml
+++ b/appendixa/m4.xml
@@ -1,7 +1,9 @@
-<sect1 id="aa-m4">
+<sect1 id="aa-m4" xreflabel="M4">
 <title>M4</title>
 <?dbhtml filename="m4.html" dir="appendixa"?>
 
+<para>For installation instructions see <xref linkend="ch06-m4"/>.</para>
+
 &aa-m4-down;
 &aa-m4-shortdesc;
 &aa-m4-desc;