## On X
- open two files to compare in two separate windows
- <kbd>M-x ediff-buffers RET RET RET</kbd>
- now the cursor is in a new small ```ediff``` frame
- <kbd>C-h k w d</kbd>
Now I see a help window explaining that <kbd>w d</kbd> runs ediff-buffers and how it works.

Maybe you had the cursor in the main frame instead of the small ```ediff``` frame?

## On terminal

Same as above, but instead of a new small frame I have a new small (one-line) ediff window. With the cursor on the new window, I can ask for help on <kbd>w d</kbd>.

Maybe you had the cursor in one of the two windows containing the files instead of the small ```ediff``` window?