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-rw-r--r--doc/manual/opt-common-syn.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/manual/opt-common-syn.xml b/doc/manual/opt-common-syn.xml
index 2e02d0038b18..9aaabb8e98ba 100644
--- a/doc/manual/opt-common-syn.xml
+++ b/doc/manual/opt-common-syn.xml
@@ -1,4 +1,4 @@
-<nop>
+<nop xmlns="http://docbook.org/ns/docbook">
   
 <arg><option>--help</option></arg>
 <arg><option>--version</option></arg>