Annual Cos Allocation

[Blattes]

Hi Everyone,
I switched from Tier 4 to Tier 2 last year in June. HenceI have got unrestricted COS. Today we have got an email from Home Office. I have asked this before but I just want to make sure it is okay. The email is:

We sent you an email two months ago to notify you that you can apply to renew your allocation of Certificates of Sponsorship (CoS) or Confirmations of Acceptance for Studies (CAS) in Tier 2 (General) . You have not yet submitted a renewal request.

This allocation will expire on 05-April-2018. If CoS/CAS will be required beyond this date, a Level 1 user will need to submit a request, with the authority of the Authorising Officer, by selecting 'Request renewal of annual CoS/CAS allocations' from the 'Licence summary, applications and services' menu in SMS. There is no fee for this request type.

Do we need to renew anything? My visa is till 2020. Thank you.

[Blattes]

Anyone?