[MediaWiki-l] Every non-existing article ín brand new Namespace redirect to default namespace

I created*) a new namespace "historisk", as an archive for articles which are no longer relevant, but kept for historical reasons.

define("NS_FOO", 500); define("NS_FOO_TALK", 501); $wgExtraNamespaces[NS_HISTORISK] = "Historisk"; $wgExtraNamespaces[NS_HISTORISK_TALK] = "Historisk_talk"; // underscore required. use it to separate all words in the title of namespace $wgContentNamespaces[] = 500;

But I must be missing something since "[[historisk:newarticle]]" (no articles exist in that extranamespaces yet and it happens no matter which articlename I enter) keeps redirecting to "[[newarticle]]" prior to the first edit, right after I enter the URL

*) http://www.mediawiki.org/wiki/Manual:Using_custom_namespaces

Did I miss something obvious or otherwise?

Henrik Rasmussen