 The producer states that a feature was added to the most recent version of their program (as of August 2009), "to convert two spaces at the end of a sentence into one", but they have "never had any requests to convert one space into two".Some computer text editors, such as Emacs and vi, originally relied on double-spacing to recognize sentence boundaries.By default, Emacs will not break a line at a single space preceded by a period, but this behavior is configurable (with the option sentence-end-double-space).