How to add the note board web part to your page layout

The situation: I'm creating a site with internal news articles, and the customer would like for people to leave comments on each one.

The problem: I tried going into SharePoint Designer and adding the web part through the interface, but then got the "sorry, I don't understand that tag" message.

The solution: It's always a matter of figuring out the proper include for the top of the page, isn't it?  Here's what I did:

1. Add the note board web part code into the page layout:
   <SharePointPortalControls:SocialCommentWebPart id="noteboard" ChromeType="None" runat="server" />
2. Add the SharePointPortalControls include to the header of my page layout:
   <%@ Register TagPrefix="SharePointPortalControls" Namespace="Microsoft.SharePoint.Portal.WebControls" Assembly="Microsoft.SharePoint.Portal, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"%>