diff --git a/types/office-js-preview/index.d.ts b/types/office-js-preview/index.d.ts
index 3ba211c4e3..ec3f71c4e5 100644
--- a/types/office-js-preview/index.d.ts
+++ b/types/office-js-preview/index.d.ts
@@ -11623,9 +11623,9 @@ declare namespace Office {
          * append-on-send runs before on-send functionality.
          *
          * **Important**: If your add-in implements the on-send feature and calls `appendOnSendAsync` in the `ItemSend` handler,
-         * an error is returned as this scenario is not supported.
+         * the `appendOnSendAsync` call returns an error as this scenario is not supported.
          *
-         * **Important**: To use `appendOnSendAsync`, the `AppendOnSend` extended permission must be included in the `ExtendedPermissions` node of the manifest.
+         * **Important**: To use `appendOnSendAsync`, the `ExtendedPermissions` manifest node must include the `AppendOnSend` extended permission.
          *
          * **Note**: To clear data from a previous `appendOnSendAsync` call, you can call it again with the `data` parameter set to `null`.
          *
@@ -11661,9 +11661,9 @@ declare namespace Office {
          * append-on-send runs before on-send functionality.
          * 
          * **Important**: If your add-in implements the on-send feature and calls `appendOnSendAsync` in the `ItemSend` handler,
-         * an error is returned as this scenario is not supported.
+         * the `appendOnSendAsync` call returns an error as this scenario is not supported.
          *
-         * **Important**: To use `appendOnSendAsync`, the `AppendOnSend` extended permission must be included in the `ExtendedPermissions` node of the manifest.
+         * **Important**: To use `appendOnSendAsync`, the `ExtendedPermissions` manifest node must include the `AppendOnSend` extended permission.
          *
          * **Note**: To clear data from a previous `appendOnSendAsync` call, you can call it again with the `data` parameter set to `null`.
          *
@@ -11950,6 +11950,13 @@ declare namespace Office {
          *
          * **Important**: In Outlook on the web, `setSignatureAsync` only works on messages.
          *
+         * **Important**: If your add-in implements the 
+         * {@link https://docs.microsoft.com/office/dev/add-ins/outlook/autolaunch | event-based activation feature using `LaunchEvent` in the manifest},
+         * and calls `setSignatureAsync` in the event handler, the following behavior applies.
+         *
+         * - When the user composes a new item (including reply or forward), the signature is set but doesn't modify the form. This means
+         * if the user closes the form without making other edits, they won't be prompted to save changes.
+         *
          * [Api set: Mailbox Preview]
          *
          * @remarks
@@ -11980,6 +11987,13 @@ declare namespace Office {
          *
          * **Important**: In Outlook on the web, `setSignatureAsync` only works on messages.
          *
+         * **Important**: If your add-in implements the 
+         * {@link https://docs.microsoft.com/office/dev/add-ins/outlook/autolaunch | event-based activation feature using `LaunchEvent` in the manifest},
+         * and calls `setSignatureAsync` in the event handler, the following behavior applies.
+         *
+         * - When the user composes a new item (including reply or forward), the signature is set but doesn't modify the form. This means
+         * if the user closes the form without making other edits, they won't be prompted to save changes.
+         *
          * [Api set: Mailbox Preview]
          *
          * @remarks