Commit c4f59bcf authored by Eli Zaretskii's avatar Eli Zaretskii

Document the optional second arg of `atan'.

parent f120431c
......@@ -625,6 +625,13 @@ and the latter now controls scrolling down.
This is like window-height but does not count the mode line
or the header line.
+++
** The function `atan' now accepts an optional second argument.
When called with 2 arguments, as in `(atan Y X)', `atan' returns the
angle in radians between the vector [X, Y] and the X axis. (This is
equivalent to the standard C library function `atan2'.)
+++
** You can now make a window as short as one line.
......
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