diff --git a/doc/arm/notes.xml b/doc/arm/notes.xml
index 9294996e35..2a99ad5fc9 100644
--- a/doc/arm/notes.xml
+++ b/doc/arm/notes.xml
@@ -267,7 +267,7 @@
 	  This is implemented in two ways: 1) by refusing to start
 	  if the configured network interfaces all return "address
 	  in use", and 2) by attempting to acquire a lock on a file
-	  specified by the <command>lock-file</option> option or
+	  specified by the <option>lock-file</option> option or
 	  the <command>-X</command> command line option.  The
 	  default lock file is
 	  <filename>/var/run/named/named.lock</filename>.