diff --git a/docs/manual.xml b/docs/manual.xml
index 3a25878..f9d1caf 100644
--- a/docs/manual.xml
+++ b/docs/manual.xml
@@ -461,7 +461,7 @@ The code would look like this:
 
 <programlisting>
 
-                UnlabeledValueArg&lt;float&gt;  nolabel( "name", "unlabeled test", 3.14,
+                UnlabeledValueArg&lt;float&gt;  nolabel( "name", "unlabeled test", true, 3.14,
                                                   "nameString"  );
                 cmd.add( nolabel );