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-rw-r--r--doc/manual/opt-common.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/manual/opt-common.xml b/doc/manual/opt-common.xml
index c36c6df41003..92b76c01f103 100644
--- a/doc/manual/opt-common.xml
+++ b/doc/manual/opt-common.xml
@@ -5,7 +5,7 @@
 
 <para>Most Nix commands accept the following command-line options:</para>
 
-<variablelist>
+<variablelist xml:id="opt-common">
 
 <varlistentry><term><option>--help</option></term>