Yes. Updates made to your record or other users’ records that you follow will appear on your feed. If you make a comment on a record update, it gets added as a note in that record’s details page. Similarly, if you delete the comment, it gets deleted from the details page as well.
I keep receiving notifications about updates on a record that I never followed. Why?
Even if you do not intentionally follow a record, you become an auto-follower of the record when,
As a result you will start receiving notifications whenever the record is modified.
For example, you have commented on a feed that is about change of a lead’s email address. You have not followed this lead. But the moment you have commented on the feed, you automatically become a follower of the record. You will receive a notification when this record is modified. The same happens if you are mentioned in a comment by another user.