How many spaces should you insert after a period? (One!) It’s a debate that has raged for ages, with some advocating for one (Our preference!), two, and if you go back far enough, even three spaces. There’s no consensus on why the number of spaces after a sentence matters—it seems merely to be a typographic style that has changed over the years. But for at least the last few decades, a single space after a period has become the norm (Yay!). Now Microsoft is weighing in on the debate, setting future versions of Microsoft Word to mark two spaces after a period as an error (Finally!). The company has been testing this feature for a while already and has received overwhelmingly positive feedback. But if you’re still in the two-space camp, you’ll be able to turn off the suggestion. And regardless, I recommend reading the comments for a lot more background and opinion (in both directions).