asp.net mvc3, how to add namespacing globally?

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I wrote a htmlhelper, then added the namespace in the web.config file.

   <pages>
        <namespaces>
            <add namespace="System.Web.Helpers" />
            <add namespace="System.Web.Mvc" />
            <add namespace="System.Web.Mvc.Ajax" />
            <add namespace="System.Web.Mvc.Html" />
            <add namespace="System.Web.Routing" />
            <add namespace="System.Web.WebPages"/>
            <add namespace="MvcApplication3.HtmlHelpers"/>
        </namespaces>
    </pages>

for some reason this is not working, in the page, I still need to import this namespace to use the htmlhelper.

@using MvcApplication3.HtmlHelpers

what did I do wrong ?

---

Be sure to add this to the web.config in the 'Views' folder, not to the root web.config. Then it should work. Example:

  <system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
      <namespaces>
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="itWORKS" />
        <add namespace="itWORKS.MVC" />
        <add namespace="OfertaPlus.Services" />
      </namespaces>
    </pages>