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-rw-r--r--doc/manual/nix-collect-garbage.xml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/manual/nix-collect-garbage.xml b/doc/manual/nix-collect-garbage.xml
index 3e4ab092588d..73739182d491 100644
--- a/doc/manual/nix-collect-garbage.xml
+++ b/doc/manual/nix-collect-garbage.xml
@@ -1,4 +1,5 @@
-<refentry>
+<refentry xmlns="http://docbook.org/ns/docbook"
+          xmlns:xlink="http://www.w3.org/1999/xlink">
   
 <refnamediv>
   <refname>nix-collect-garbage</refname>