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-rw-r--r--chapter04/chapter04.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/chapter04/chapter04.xml b/chapter04/chapter04.xml
index 36a04ae34..3944f63dd 100644
--- a/chapter04/chapter04.xml
+++ b/chapter04/chapter04.xml
@@ -1,4 +1,4 @@
-<chapter id="chapter04">
+<chapter id="chapter04" xreflabel="Chapter 4">
<title>The materials: packages and patches</title>
<?dbhtml filename="chapter04.html" dir="chapter04"?>