diff --git a/api/assign_ticket.php b/api/assign_ticket.php
index c616de5..1046909 100644
--- a/api/assign_ticket.php
+++ b/api/assign_ticket.php
@@ -76,7 +76,8 @@ if ($assignedTo === null || $assignedTo === '') {
                 $ticket['title'] ?? "Ticket #{$ticketId}",
                 $assigneeName,
                 $assigneeMatrix,
-                $changedByDisplay
+                $changedByDisplay,
+                $ticket['visibility'] ?? 'public'
             );
         }
     }
diff --git a/helpers/NotificationHelper.php b/helpers/NotificationHelper.php
index 532d8aa..179043f 100644
--- a/helpers/NotificationHelper.php
+++ b/helpers/NotificationHelper.php
@@ -280,8 +280,14 @@ class NotificationHelper
      * @param string|null $assigneeName    Display name of new assignee
      * @param string|null $assigneeMatrix  Matrix user ID of new assignee (to DM)
      * @param string|null $changedByDisplay
+     * @param string      $visibility      Ticket visibility; non-public titles are
+     *                                      redacted before being sent to the shared
+     *                                      notify list, same as sendTicketNotification().
+     *                                      The assignee is DMed directly regardless,
+     *                                      since they now have standing access to the
+     *                                      ticket by virtue of being assigned to it.
      */
-    public static function sendAssignmentNotification($ticketId, string $ticketTitle, ?string $assigneeName, ?string $assigneeMatrix, ?string $changedByDisplay = null): void
+    public static function sendAssignmentNotification($ticketId, string $ticketTitle, ?string $assigneeName, ?string $assigneeMatrix, ?string $changedByDisplay = null, string $visibility = 'public'): void
     {
         $notifyUsers = self::notifyUsers();
         // Also notify the assignee directly if we know their Matrix ID
@@ -295,7 +301,7 @@ class NotificationHelper
         self::fire([
             'event'        => 'assigned',
             'ticket_id'    => $ticketId,
-            'title'        => $ticketTitle,
+            'title'        => self::redactedTitle($ticketTitle, $visibility),
             'assignee'     => $assigneeName,
             'changed_by'   => $changedByDisplay,
             'url'          => UrlHelper::ticketUrl($ticketId),