Not forgetting…
Definition 1 of 1
Pro Tip 1/3Reminder Nuance
Expresses you're mentioning something easily missed but significant. 
Make sure to call everyone, not forgetting Uncle Bob who is traveling.
Pro Tip 2/3Summarize Lists
Concludes lists of instructions or items, emphasizing the last point. 
Bring your hat, sunscreen, and not forgetting your sunglasses.
Pro Tip 3/3Inclusive Addition
Ensures everything or everyone is considered, leaving no one or nothing out. 
Invitations were sent to all relatives, not forgetting the distant cousins.