diff --git a/runtime/doc/windows.txt b/runtime/doc/windows.txt
index 5951473..5c64897 100644
--- a/runtime/doc/windows.txt
+++ b/runtime/doc/windows.txt
@@ -183,6 +183,8 @@
 		3. 'eadirection' isn't "ver", and
 		4. one of the other windows is wider than the current or new
 		   window.
+		If N was given make the new window N columns wide, if
+		possible.
 		Note: In other places CTRL-Q does the same as CTRL-V, but here
 		it doesn't!