diff --git a/mobile/openapi/lib/api/assets_api.dart b/mobile/openapi/lib/api/assets_api.dart
index 03d91c9da..e737397fc 100644
Binary files a/mobile/openapi/lib/api/assets_api.dart and b/mobile/openapi/lib/api/assets_api.dart differ
diff --git a/open-api/immich-openapi-specs.json b/open-api/immich-openapi-specs.json
index 28b61c421..fb329d265 100644
--- a/open-api/immich-openapi-specs.json
+++ b/open-api/immich-openapi-specs.json
@@ -4279,7 +4279,7 @@
     },
     "/assets/{id}/thumbnail": {
       "get": {
-        "description": "Retrieve the thumbnail image for the specified asset.",
+        "description": "Retrieve the thumbnail image for the specified asset. Viewing the fullsize thumbnail might redirect to downloadAsset, which requires a different permission.",
         "operationId": "viewAsset",
         "parameters": [
           {
diff --git a/server/src/controllers/asset-media.controller.ts b/server/src/controllers/asset-media.controller.ts
index 3ef63ff7f..ec6083cfa 100644
--- a/server/src/controllers/asset-media.controller.ts
+++ b/server/src/controllers/asset-media.controller.ts
@@ -147,7 +147,8 @@ export class AssetMediaController {
   @Authenticated({ permission: Permission.AssetView, sharedLink: true })
   @Endpoint({
     summary: 'View asset thumbnail',
-    description: 'Retrieve the thumbnail image for the specified asset.',
+    description:
+      'Retrieve the thumbnail image for the specified asset. Viewing the fullsize thumbnail might redirect to downloadAsset, which requires a different permission.',
     history: new HistoryBuilder().added('v1').beta('v1').stable('v2'),
   })
   async viewAsset(