diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 1641361..5f9f51e 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jan 23
+*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jan 25
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -381,6 +381,7 @@
 |CursorMoved|		the cursor was moved in Normal mode
 |CursorMovedI|		the cursor was moved in Insert mode
 
+|WinNewPre|		before creating a new window
 |WinNew|		after creating a new window
 |TabNew|		after creating a new tab page
 |WinClosed|		after closing a window
@@ -1390,6 +1391,18 @@
 				WinLeave autocommands (but not for ":new").
 				Not used for ":qa" or ":q" when exiting Vim.
 
+							*WinNewPre*
+WinNewPre			Before creating a new window. Triggered
+				before commands that modify window layout by
+				creating a split or new tab page. Not done for
+				the first window, when Vim has just started.
+				It is not allowed to modify window layout
+				while executing commands for the WinNewPre
+				event.
+				Most useful to store current window layout
+				and compare it with the new layout after the
+				Window has been created.
+
 							*WinNew*
 WinNew				When a new window was created.  Not done for
 				the first window, when Vim has just started.