diff --git a/doc/vim9class.jax b/doc/vim9class.jax
index e6ec8afbe..a8d774ead 100644
--- a/doc/vim9class.jax
+++ b/doc/vim9class.jax
@@ -1,4 +1,4 @@
-*vim9class.txt*	For Vim バージョン 9.1.  Last change: 2025 Feb 16
+*vim9class.txt*	For Vim バージョン 9.1.  Last change: 2025 Apr 05
 
 
 		  VIMリファレンスマニュアル	  by Bram Moolenaar
@@ -636,9 +636,9 @@ Shape, Square および Triangle を使用した上記の例は、オブジェ
 れる。オブジェクトがクラスからインスタンス化されると、変数の型が設定される。
 
 次の予約キーワード名は、オブジェクトまたはクラス変数名として使用できない:
-"super", "this", "true", "false", "null", "null_blob", "null_dict",
-"null_function", "null_list", "null_partial", "null_string", "null_channel" お
-よび "null_job"。
+"super", "this", "true", "false", "null", "null_blob", "null_channel",
+"null_class", "null_dict", "null_function", "null_job", "null_list",
+"null_object", "null_partial" および "null_string"。
 
 クラスを拡張する ~
 							*extends*
diff --git a/en/vim9class.txt b/en/vim9class.txt
index 7ba91e7d9..5d6f7fca1 100644
--- a/en/vim9class.txt
+++ b/en/vim9class.txt
@@ -1,4 +1,4 @@
-*vim9class.txt*	For Vim version 9.1.  Last change: 2025 Feb 16
+*vim9class.txt*	For Vim version 9.1.  Last change: 2025 Apr 05
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -641,8 +641,8 @@ class, then the type of the variable is set.
 
 The following reserved keyword names cannot be used as an object or class
 variable name: "super", "this", "true", "false", "null", "null_blob",
-"null_dict", "null_function", "null_list", "null_partial", "null_string",
-"null_channel" and "null_job".
+"null_channel", "null_class", "null_dict", "null_function", "null_job",
+"null_list", "null_object", "null_partial" and "null_string".
 
 Extending a class ~
 							*extends*