 Although the default setting for many applications' grammar-checkers (e.g., Microsoft Word) is single sentence spacing, they can be adjusted to recognize double sentence spacing as correct also.A program called PerfectIt is an "MS Word add-in that helps professionals to proofread faster".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".