Currently in lisp-mode the little documentation box that pops up only appears when you type a space, and disappears when you type a non-space character. I'd like to be able to keep the documentation for the form my cursor is currently editing open even when I type a non-space character

Currently in lisp-mode the little documentation box that pops up only appears when you type a space, and disappears when you type a non-space character. I'd like to be able to keep the documentation for the form my cursor is currently editing open even when I type a non-space character