diff --git a/public/openapi/read/notifications.yaml b/public/openapi/read/notifications.yaml
index 015b6fae33..8dd723aabf 100644
--- a/public/openapi/read/notifications.yaml
+++ b/public/openapi/read/notifications.yaml
@@ -71,6 +71,11 @@ get:
                           type: boolean
                         readClass:
                           type: string
+                  unreadNids:
+                    type: array
+                    description: An array of notification ids that are unread.
+                    items:
+                      type: string
                   filters:
                     $ref: ../components/schemas/NotificationFilters.yaml#/FiltersArray
                   regularFilters:
diff --git a/src/controllers/accounts/notifications.js b/src/controllers/accounts/notifications.js
index 301851ca36..00b94f0acb 100644
--- a/src/controllers/accounts/notifications.js
+++ b/src/controllers/accounts/notifications.js
@@ -61,6 +61,7 @@ notificationsController.get = async function (req, res, next) {
 	const data = await user.notifications.getAllWithCounts(req.uid, selectedFilter.filter);
 	let notifications = await user.notifications.getNotifications(data.nids, req.uid);
 
+	const unreadNids = notifications.filter(n => n && n.nid && !n.read).map(n => n.nid);
 	allFilters.forEach((filterData) => {
 		if (filterData && filterData.filter) {
 			filterData.count = data.counts[filterData.filter] || 0;
@@ -72,6 +73,7 @@ notificationsController.get = async function (req, res, next) {
 
 	res.render('notifications', {
 		notifications: notifications,
+		unreadNids,
 		pagination: pagination.create(page, pageCount, req.query),
 		filters: allFilters,
 		regularFilters: regularFilters,