In many Commonwealth navies (e.g. Canada and Australia), the rank of acting sub-lieutenant still exists as a commissioned rank equivalent to second lieutenant, while the rank of sub-lieutenant is equivalent to that of an army lieutenant. As the term "acting" is a designation, both acting and substantive ranks should be addressed as "sub-lieutenant"; the full designation including "acting" should be used in written documents, however. Indeed, when someone is addressed as "Acting sub-lieutenant", it can be seen as a way of patronising an individual in a derogatory manner due to the emphasis of their "acting" rank.