diff --git a/docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md b/docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md
index d2134773c..cc2db5561 100644
--- a/docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md
+++ b/docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md
@@ -1,7 +1,7 @@
 ---
 title: Outlook add-in API preview requirement set
 description: Features and APIs that are currently in preview for Outlook add-ins.
-ms.date: 03/11/2025
+ms.date: 09/26/2025
 ms.topic: whats-new
 ms.localizationpriority: medium
 ---
@@ -75,6 +75,20 @@ Added a new property that represents if an appointment is an all-day event.
 
 ---
 
+### Store even more custom data for a mail item during an Outlook session
+
+#### [Office.context.mailbox.item.sessionData.setAsync](/javascript/api/outlook/office.sessiondata?view=outlook-js-preview&preserve-view=true#outlook-office-sessiondata-setasync-member)
+
+Updated the `SessionData` object limit to 2,621,440 characters.
+
+**Available in**: Classic Outlook on Windows (Microsoft 365 subscription)
+
+<br>
+
+---
+
+---
+
 ### Temporarily set the body or subject displayed in read mode
 
 #### [Office.context.mailbox.item.display](/javascript/api/outlook/office.messageread?view=outlook-js-preview&preserve-view=true#outlook-office-messageread-display-member)