diff --git a/types/office-js/index.d.ts b/types/office-js/index.d.ts
index a7cb625df0..a2ae5cc848 100644
--- a/types/office-js/index.d.ts
+++ b/types/office-js/index.d.ts
@@ -1909,9 +1909,9 @@ declare namespace Office {
          */
         DocumentSelectionChanged,
         /**
-         * Triggers when the selected Outlook item is changed.
+         * Triggers when a different Outlook item is selected for viewing while the task pane is pinned.
          * 
-         * [Api set: Mailbox 1.1]
+         * [Api set: Mailbox 1.5]
          */
         ItemChanged,
         /**