diff --git a/docs/tree/loading_data.md b/docs/tree/loading_data.md
index 4e0ce49f..29a3ea88 100644
--- a/docs/tree/loading_data.md
+++ b/docs/tree/loading_data.md
@@ -104,6 +104,10 @@ Each object in the data set contains configuration of a tree item. The structure
             <td><b>checkbox</b></td>
             <td>(<i>boolean</i>) optional, enables/disables displaying a checkbox for a tree item</td>
         </tr>
+        <tr>
+            <td><b>checked</b></td>
+            <td>(<i>boolean</i>) optional, checks/unchecks a checkbox of a tree item, works when the <b>checkbox</b> property is set to <i>true</i></td>
+        </tr>
         <tr>
             <td><b>items</b></td>
             <td>(<i>array</i>) an array of nested items</td>
diff --git a/docs/whatsnew.md b/docs/whatsnew.md
index cfc9a47c..a68529fe 100644
--- a/docs/whatsnew.md
+++ b/docs/whatsnew.md
@@ -8,6 +8,20 @@ description: You can explore what's new in DHTMLX Suite and its release history
 
 Before updating DHTMLX to the latest version, please check the [Migration to Newer Versions](migration.md) guide to avoid possible breakdowns.
 
+Version 8.4.1
+------------------
+
+Released on July 25, 2024
+
+### Fixes
+
+- Combobox. Custom scroll not working 
+- Form. The value selected in the Combo control restores after the options reloading
+- Form. The input destructor issue while using Optimus
+- Form. The `enable()` method fails when a form contains a Fieldset control with a spacer
+- Grid/TreeGrid. Row selection gets lost after dragging a column 
+- Tree. Checkbox states are not displayed in the serialized data
+
 Version 8.4 
 ------------------