diff --git a/runtime/doc/editing.txt b/runtime/doc/editing.txt
index fc4080c..d6161b1 100644
--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1,4 +1,4 @@
-*editing.txt*   For Vim version 8.2.  Last change: 2021 Dec 11
+*editing.txt*   For Vim version 8.2.  Last change: 2021 Dec 27
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1147,6 +1147,9 @@
 			made.
 			When 'hidden' is set and there are more windows, the
 			current buffer becomes hidden, after writing the file.
+			This command is not supported in |Vim9| script,
+			because it is too easily confused with a variable
+			name.
 
 							*:exi* *:exit*
 :[range]exi[t][!] [++opt] [file]