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-rw-r--r--doc/manual/nix-copy-closure.xml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/manual/nix-copy-closure.xml b/doc/manual/nix-copy-closure.xml
index ddbd8e6944cc..584e713f14e0 100644
--- a/doc/manual/nix-copy-closure.xml
+++ b/doc/manual/nix-copy-closure.xml
@@ -1,6 +1,7 @@
 <refentry xmlns="http://docbook.org/ns/docbook"
           xmlns:xlink="http://www.w3.org/1999/xlink"
-          xmlns:xi="http://www.w3.org/2001/XInclude">
+          xmlns:xi="http://www.w3.org/2001/XInclude"
+          xml:id="sec-nix-copy-closure">
 
 <refmeta>
   <refentrytitle>nix-copy-closure</refentrytitle>