Update README.md

README.md

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 # PAUSE-nx
 
-TO use, while ingame press the left d-pad button. This will pause the game. Press again to unpause. If you press d-pad up while the game is paused in this way, it will advance 1 frame. Games can buffer inputs this way if you hold then during the pause then let the game play.
+To use, while ingame press the left d-pad button. This will pause the game. Press again to unpause. If you press d-pad up while the game is paused in this way, it will advance 1 frame. While using a connected USB keyboard, press the down arrow key to pause and the right arrow key to frame advance. Games can buffer inputs this way if you hold then during the pause then let the game play.
 
 INI libraries found here: https://github.com/benhoyt/inih