I am not a fan of tagging pages with {{refimprove}} as opposed to using {{citation needed}} tags, unless the page has very obvious and extensive issues with references (or BLPs). Refimprove tags are, in my opinion, quite ugly and unsightly things. They also make the page content start later and take up much space. Citation needed tags on the other hand do not take much space and are also more specific.
Avoid phrases such as remember that and note that, which address readers directly in an unencyclopedic tone. Similarly, phrases such as of course, naturally, obviously, clearly, and actually make presumptions about readers' knowledge, and call into question the reason for including the information in the first place.