Manual talk:$wgNamespaceProtection

How would one use $wgNamespaceProtection to prevent editing of a custom namespace? Say one's got:

$wgGroupPermissions['comics']['read'] = true;

$wgExtraNamespaces = array(100 => "Comics",                          101 => "Comics_talk"                           );

...and I wanted only folks in the 'comics' group to be able to edit the Comics (100) namespace?