diff --git a/apps/api_web/lib/api_web/views/alert_view.ex b/apps/api_web/lib/api_web/views/alert_view.ex
index 398066d8c..e699115cc 100644
--- a/apps/api_web/lib/api_web/views/alert_view.ex
+++ b/apps/api_web/lib/api_web/views/alert_view.ex
@@ -27,7 +27,8 @@ defmodule ApiWeb.AlertView do
     :banner,
     :url,
     :image,
-    :image_alternative_text
+    :image_alternative_text,
+    :duration_certainty
   ])
 
   def active_period(%{active_period: periods}, _conn) do
diff --git a/apps/api_web/test/api_web/views/alert_view_test.exs b/apps/api_web/test/api_web/views/alert_view_test.exs
index a0fb1626b..1b3e1e9a2 100644
--- a/apps/api_web/test/api_web/views/alert_view_test.exs
+++ b/apps/api_web/test/api_web/views/alert_view_test.exs
@@ -22,7 +22,8 @@ defmodule ApiWeb.AlertViewTest do
     timeframe: "timeframe",
     lifecycle: "lifecycle",
     image: "image",
-    image_alternative_text: "image alternative text"
+    image_alternative_text: "image alternative text",
+    duration_certainty: "KNOWN"
   }
 
   test "can do a basic rendering (does not include relationships)", %{conn: conn} do
@@ -52,7 +53,8 @@ defmodule ApiWeb.AlertViewTest do
              "informed_entity" => @alert.informed_entity,
              "service_effect" => @alert.service_effect,
              "timeframe" => @alert.timeframe,
-             "lifecycle" => @alert.lifecycle
+             "lifecycle" => @alert.lifecycle,
+             "duration_certainty" => @alert.duration_certainty
            }
 
     refute rendered["relationships"]