diff --git a/Improvements-in-v3.5.0.md b/Improvements-in-v3.5.0.md
index 0f7b20b..d9ff5cb 100644
--- a/Improvements-in-v3.5.0.md
+++ b/Improvements-in-v3.5.0.md
@@ -496,6 +496,32 @@ _Released to registered users of the Plus Edition on October 5, 2022._
 * In PropertyGrid, using the SelectedObjectsOverride property along with the ShowTitle property set to false no longer displays the title before hiding it and creating a flicker.
 * When using the Office 2007 themes, WatermarkComboBox now displays the selected item if the IsEditable property is set to true.
 
+## <a id="Plus451"></a>v4.5.1 Plus Edition
+
+_Released to registered users of the Plus Edition on April 3, 2023._
+
+**19 improvements and bug fixes**
+
+* In AvalonDock, the DockingManager.PreviewDock & DockingManager.Docked events are now raised properly when docking from a LayoutContent.
+* In AvalonDock, a NullReferenceException is no longer thrown when opening a LayoutDocument as a floating window.
+* In CheckComboBox and CheckListBox, the Command is now executed when SelectAll or UnSelectAll is used.
+* DateTimeUpDown.TryParseDateTime() is now a protected virtual method.
+* In NumericUpDowns, an invalid numeric value is no longer set on the NumericUpDown when extra numeric values are added with the keyboard while a FormatString includes special characters like %.
+* In PropertyGrid, the order of the categories will now be respected when using CategoryOrder attributes in tandem with the CategoryPropertyOrder attribute.
+* In PropertyGrid, all the properties will now be displayed properly when using the categorized mode in .NET 7.
+* When getting the dlls from NuGet, the "wrong package" warning that appeared for System.Drawing.Common no longer appears.
+* In WatermarkComboBox, the focus highlight is now showed as expected when hovering over the control.
+* In Chart, the graduation of Ticks no longer increments until a maximum value is reached when Axis’ LabelDecimalCount property is used.
+* In Chart, the Ticks will no longer be displayed off the Chart when the range starts below 0 and ends over 0.
+* In Chart, a new property, called Area.GridBackgroundTemplate, can now be used to set a background to the Grid-only part of the Chart`s Area.
+* In ExtendedTabControl, a new event, called AddTabEvent, was added for when a new TabItem is added in the control.
+* In Extended TabControl, a new event, called RemoveTabEvent, will be raised when a TabItem is removed from the control.
+* In ExtendedTabControl, it is now possible to add items of a custom type using the ItemsSource.
+* In ExtendedTabControl, an IndexOutOfRangeException is no longer thrown when the ItemsSource property or the Items collection are modified.
+* In PropertyGrid, setting the IsReadOnly property to true no longer collapses the expanded categories when the ExpandedCategoryAttribute is set to false and the categories are expanded using either code or the mouse.
+* In PropertyGrid, the values of the NumericUpDowns are now displayed correctly by UIAutomation.
+* In TokenizedTextBox, exceptions are no longer raised when text is pasted.
+
 We hope you love this release and decide to support the project by getting a license to Xceed Toolkit Plus for WPF.
 -- Xceed Team