We're not sure what you mean by asset ownership being "overwritten on a change". The Summary tab of Windows computer webpages only lists the last logged on user, if this is what you're referring to. Previous logins can be found under Config/User Info/Last Logon however.
If you would like to manually track asset ownership, we would recommend using
asset relations, not comments. This feature allows you to keep a history as well, e.g.:
January 20th: Asset A assigned to user A
January 21st: Asset A assigned to user B
etc.