(Vertical Scrolling): Document what does nil mean as the first arg of

set-window-vscroll.

diff --git a/lispref/windows.texi b/lispref/windows.texi
index 24855db2e60f011b1c9c5923fcbe06a6de3279c3..b6d215f50c87664b6cc3e3f2de079f55f58c6c86 100644 (file)
--- a/lispref/windows.texi
+++ b/lispref/windows.texi
@@ -1490,6 +1490,8 @@ This function sets @var{window}'s vertical scroll position to
 @var{lines}.  The argument @var{lines} should be zero or positive; if
 not, it is taken as zero.
 
+If @var{window} is @code{nil}, the selected window is used.
+
 The actual vertical scroll position must always correspond
 to an integral number of pixels, so the value you specify
 is rounded accordingly.