[Zope] Hotfix / 2.2.0 question

Greetings, fellow Zopers! A quick, non-urgent question for you all: After recently upgrading to 2.2.0, I noticed that under Control Panels/Products, I still had an entry for the security Hotfix from oh, so long ago, despite the fact that it's quite absent from my 2.2.0 Products directory. I just assumed it was safe to delete, so I did, but I'm wondering why it was there, and if, indeed, I should have deleted it. :) Thanks for your help, CJ