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-rw-r--r--doc/manual/nix-env.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/manual/nix-env.xml b/doc/manual/nix-env.xml
index 9f73b2d4c..6bf0513ac 100644
--- a/doc/manual/nix-env.xml
+++ b/doc/manual/nix-env.xml
@@ -526,7 +526,7 @@ upgrading `mozilla-1.2' to `mozilla-1.4'</screen>
</refsection>
-<refsection><title>Versions</title>
+<refsection xml:id="ssec-version-comparisons"><title>Versions</title>
<para>The upgrade operation determines whether a derivation
<varname>y</varname> is an upgrade of a derivation