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-rw-r--r--nixos/doc/manual/manual.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/doc/manual/manual.xml b/nixos/doc/manual/manual.xml
index e9338efbc025..a5efde32885c 100644
--- a/nixos/doc/manual/manual.xml
+++ b/nixos/doc/manual/manual.xml
@@ -8,7 +8,7 @@
   <subtitle>Version <xi:include href="./generated/version" parse="text" />
   </subtitle>
  </info>
- <preface>
+ <preface xml:id="preface">
   <title>Preface</title>
   <para>
    This manual describes how to install, use and extend NixOS, a Linux