To make typographic quotation marks easier to enter, publishing software often automatically converts typewriter quotation marks (and apostrophes) to typographic form during text entry (with or without the user being aware of it). This is known as the “smart quotes” feature. Quotation marks that are not automatically altered by computer programs are known as “dumb quotes”. Some implementations incorrectly produce an opening single quotation mark in places where an apostrophe is required, for example, in abbreviated years like "’08" for "2008".