diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index ea9a220..3b37627 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 8.2.  Last change: 2020 Nov 12
+*autocmd.txt*   For Vim version 8.2.  Last change: 2020 Dec 10
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -70,7 +70,8 @@
 The special pattern <buffer> or <buffer=N> defines a buffer-local autocommand.
 See |autocmd-buflocal|.
 
-If the `:autocmd` is in Vim9 script then {cmd} will be executed as in Vim9
+If the `:autocmd` is in Vim9 script (a script that starts with `:vim9script`
+and in a `:def` function) then {cmd} will be executed as in Vim9
 script.  Thus this depends on where the autocmd is defined, not where it is
 triggered.