diff --git a/src/Module/Api/Mastodon/Notifications.php b/src/Module/Api/Mastodon/Notifications.php
index 4ab71d88f9..0ea6b72e2e 100644
--- a/src/Module/Api/Mastodon/Notifications.php
+++ b/src/Module/Api/Mastodon/Notifications.php
@@ -63,12 +63,16 @@ class Notifications extends BaseApi
 			'exclude_types' => [],    // Array of types to exclude (follow, favourite, reblog, mention, poll, follow_request)
 			'account_id'    => 0,     // Return only notifications received from this account
 			'with_muted'    => false, // Pleroma extension: return activities by muted (not by blocked!) users.
-			'count'         => 0,     // Unknown parameter
+			'count'         => 0,
+			'include_all'   => false  // Include dismissed and undismissed
 		], $request);
 
 		$params = ['order' => ['id' => true]];
 
 		$condition = ['uid' => $uid, 'dismissed' => false];
+		if($request['include_all']) {
+			$condition = ['uid' => $uid];
+		}
 
 		if (!empty($request['account_id'])) {
 			$contact = Contact::getById($request['account_id'], ['url']);