Those tiny bumps on the F and J keys aren't manufacturing marks; they let your fingers find the home row without looking at the keyboard

Place your fingers on your keyboard without looking down. If you are using a standard QWERTY layout, your index fingers will likely land on two small raised bumps, one on the F key and one on the J key. These markers are intentional. They give your fingers a quick tactile reference point for finding the home row, so you can position your hands without having to look at the keys.

The F and J keys sit near the centre of the keyboard, directly beneath the index fingers when your hands are positioned on the home row. The markers help establish that starting position. Once your index fingers find them, the other fingers can settle around the neighbouring keys, with the left hand covering A, S, D and F and the right hand covering J, K, L and the semicolon key.

Why this small cue does so much work

This simple design is especially useful for touch typing, where the goal is to type without constantly looking at the keyboard. Instead of searching visually for a particular letter, a typist can use the bumps to confirm that their hands are correctly positioned and then rely on practiced finger movements to reach the other keys.

The idea also has an accessibility benefit. The U.S. government's Section 508 accessibility requirements specify that alphabetic keyboards should use a QWERTY-like layout and that the F and J keys should be tactually distinguishable from the other keys. The broader requirements also call for keys and controls to be visually distinguishable and tactilely discernible. That means the small ridges are not simply decorative details. They are part of a design approach that allows people to identify important controls through touch.

For someone learning to type, the bumps can also serve as a useful starting point. Rather than memorising the entire keyboard at once, a beginner can first learn where the home row is and use the raised markers as reference points. With practice, the fingers can begin returning to the correct positions automatically.

The same feature can be useful whether someone is typing an email, filling out a form, working on a spreadsheet, or writing a long document. Keeping the hands correctly positioned reduces the need to interrupt typing to check where the fingers are.

It is also a good example of how accessibility features can benefit a much wider group of people. A tactile marker that helps someone locate the home row without vision can also make touch typing easier for sighted users who are trying to keep their eyes on the screen.

The keyboard may look like a simple collection of similar square keys, but the F and J bumps show how much thought can go into such a familiar object. The bump is inexpensive to produce and helps both blind and sighted typists find the home row by touch.

The next time your fingers automatically move to those two bumps, you can be sure you are using an intentionally designed element defined by a standard that helps you find your way around with your eyes closed.