The windowpane trick is a simple way to know if your dough is kneaded enough. Simply cut off a small piece of dough, about the size of a golf ball, and hold it between your thumbs and first two fingers. Gently spread your thumbs and fingers apart, stretching the dough until its thin and translucent (like a windowpane). If you're able to stretch the dough without it breaking it means the gluten is well-developed and ready to begin rising. If the dough breaks, keep kneading for another 5 minutes and test again.