diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 0b3d59e..0cddeff 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2024 Feb 12
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Feb 20
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -10762,10 +10762,10 @@
 			GetWinid()->win_screenpos()
 <
 win_splitmove({nr}, {target} [, {options}])		*win_splitmove()*
-		Move the window {nr} to a new split of the window {target}.
-		This is similar to moving to {target}, creating a new window
-		using |:split| but having the same contents as window {nr}, and
-		then closing {nr}.
+		Temporarily switch to window {target}, then move window {nr}
+		to a new split adjacent to {target}.
+		Unlike commands such as |:split|, no new windows are created
+		(the |window-ID| of window {nr} is unchanged after the move).
 
 		Both {nr} and {target} can be window numbers or |window-ID|s.
 		Both must be in the current tab page.