diff --git a/runtime/doc/cmdline.txt b/runtime/doc/cmdline.txt
index 55b1a63..d2e476f 100644
--- a/runtime/doc/cmdline.txt
+++ b/runtime/doc/cmdline.txt
@@ -1,4 +1,4 @@
-*cmdline.txt*   For Vim version 9.0.  Last change: 2023 Feb 08
+*cmdline.txt*   For Vim version 9.0.  Last change: 2023 May 20
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -962,9 +962,10 @@
 		   write.  *E495*
 							*:<abuf>* *<abuf>*
 	<abuf>     When executing autocommands, is replaced with the currently
-		   effective buffer number (for ":r file" and ":so file" it is
-		   the current buffer, the file being read/sourced is not in a
-		   buffer).  *E496*
+		   effective buffer number.  It is not set for all events,
+		   also see |bufnr()|.  For ":r file" and ":so file" it is the
+		   current buffer, the file being read/sourced is not in a
+		   buffer.  *E496*
 							*:<amatch>* *<amatch>*
 	<amatch>   When executing autocommands, is replaced with the match for
 		   which this autocommand was executed.  *E497*