diff --git a/lib/ads/formats.ts b/lib/ads/formats.ts
index 38593b4b..16f92491 100644
--- a/lib/ads/formats.ts
+++ b/lib/ads/formats.ts
@@ -23,6 +23,7 @@ export const PUBLISHER_FORMAT_IDS: AdFormatId[] = [
   "banner_300x250",
   "banner_728x90",
   "banner_320x50",
+  "text_link",
 ];
 
 export function formatSpec(id: AdFormatId) {
diff --git a/supabase/migrations/20260717130000_ad_slot_text_link_format.sql b/supabase/migrations/20260717130000_ad_slot_text_link_format.sql
new file mode 100644
index 00000000..3ac77360
--- /dev/null
+++ b/supabase/migrations/20260717130000_ad_slot_text_link_format.sql
@@ -0,0 +1,16 @@
+-- Allow the native text-link ad to serve on publisher slots.
+--
+-- ad_slots.formats gates which sizes serveAd() will fill for a slot, and its
+-- original default predates the text_link format:
+--   default array['banner_300x250','banner_728x90','banner_320x50']
+-- So a publisher who copies the new text-link embed would get nothing back.
+-- Widen the default for new slots and backfill existing ones so their
+-- text-link embed actually fills.
+
+alter table public.ad_slots
+  alter column formats
+  set default array['banner_300x250', 'banner_728x90', 'banner_320x50', 'text_link'];
+
+update public.ad_slots
+  set formats = array_append(formats, 'text_link')
+  where not ('text_link' = any (formats));