I'm getting, "you're not using the rel="canonical" META attribute" in my crawl diagnotic

[blackboxideas]

I'm running a campaign crawler through Moz on this particular page: http://www.henley.ac.uk/executive-education/leadership-and-management-programmes/ but I'm getting a notifcaiton from Moz saying, "you're not using the rel="canonical" META attribute"

I don't understand what this means!! Has anyone else had this problem, or can they help me understand what this means and how to fix it?

Oh, and Happy Thanksgiving from the UK!

Virginia

[webtheoria.com]

It doesn't necessary affect your rankings, but it could sometimes mess things up. I would suggest just ask your developer to include it for every page. If two pages have similar content, you may choose to use the same canonical, so that google would index only one of those two pages.

hope this helps...

[blackboxideas]

Hi,

Thanks for your repsonse!

None of the pages on the Henley.ac.uk site have a rel="canonical" on them. Is this a bad thing? Does this effect overall SEO?

Thanks,

Virginia

[webtheoria.com]

 <code>You should have the below canonical tag in you meta information! This should be available for every page of your website!

Check also the information posted by Google (guidelines) on the below link:
[https://support.google.com/webmasters/answer/139066?hl=en](https://support.google.com/webmasters/answer/139066?hl=en) PS. If you view the source code of this very page, it has it's own canonical! This is to help crawlers identify the uniqueness of the page, especially if you have two pages with similar or duplicated content.</code>