diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 751fbc2..782c42f 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 May 25
+*builtin.txt*	For Vim version 9.1.  Last change: 2024 Jun 03
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -178,6 +178,8 @@
 				List/Dict like |extend()| but creates a new
 					List or Dictionary
 feedkeys({string} [, {mode}])	Number	add key sequence to typeahead buffer
+filecopy({from}, {to})		Number	|TRUE| if copying file {from} to {to}
+					worked
 filereadable({file})		Number	|TRUE| if {file} is a readable file
 filewritable({file})		Number	|TRUE| if {file} is a writable file
 filter({expr1}, {expr2})	List/Dict/Blob/String
@@ -2757,6 +2759,18 @@
 		Can also be used as a |method|: >
 			GetInput()->feedkeys()
 
+filecopy({from}, {to})					*filecopy()*
+		Copy the file pointed to by the name {from} to {to}. The
+		result is a Number, which is |TRUE| if the file was copied
+		successfully, and |FALSE| when it failed.
+		If a file with name {to} already exists, it will fail.
+		Note that it does not handle directories (yet).
+
+		This function is not available in the |sandbox|.
+
+		Can also be used as a |method|: >
+			GetOldName()->filecopy(newname)
+
 filereadable({file})					*filereadable()*
 		The result is a Number, which is |TRUE| when a file with the
 		name {file} exists, and can be read.  If {file} doesn't exist,