diff --git a/api/src/models/examples.ts b/api/src/models/examples.ts
index 25f2f765..8fa3e73d 100644
--- a/api/src/models/examples.ts
+++ b/api/src/models/examples.ts
@@ -1,5 +1,23 @@
+import type { TSchema } from "elysia";
 import type { CompleteVideo } from "./video";
 
+export const registerExamples = <T extends TSchema>(
+	schema: T,
+	...examples: (T["static"] | undefined)[]
+) => {
+	for (const example of examples) {
+		if (!example) continue;
+		for (const [key, val] of Object.entries(example)) {
+			const prop = schema.properties[
+				key as keyof typeof schema.properties
+			] as TSchema;
+			if (!prop) continue;
+			prop.examples ??= [];
+			prop.examples.push(val);
+		}
+	}
+};
+
 export const bubble: CompleteVideo = {
 	id: "0934da28-4a49-404e-920b-a150404a3b6d",
 	path: "/video/Bubble/Bubble (2022).mkv",
@@ -21,7 +39,7 @@ export const bubble: CompleteVideo = {
 		status: "finished",
 		runtime: 101,
 		airDate: "2022-02-14",
-		originalLanguage: null,
+		originalLanguage: "ja",
 		poster: {
 			id: "befdc7dd-2a67-0704-92af-90d49eee0315",
 			source:
diff --git a/api/src/models/movie.ts b/api/src/models/movie.ts
index beed9b03..3555a5e4 100644
--- a/api/src/models/movie.ts
+++ b/api/src/models/movie.ts
@@ -2,7 +2,8 @@ import { t } from "elysia";
 import { Genre, ShowStatus } from "./show";
 import { Image } from "./image";
 import { ExternalId } from "./external-id";
-import { bubble } from "./examples";
+import { bubble, registerExamples } from "./examples";
+import { comment } from "../utils";
 
 export const Movie = t.Object({
 	id: t.String({ format: "uuid" }),
@@ -19,7 +20,15 @@ export const Movie = t.Object({
 	runtime: t.Nullable(t.Number({ minimum: 0 })),
 
 	airDate: t.Nullable(t.String({ format: "date" })),
-	originalLanguage: t.Nullable(t.String()),
+	originalLanguage: t.Nullable(
+		t.String({
+			description: comment`
+				The language code this movie was made in.
+				This is a BCP 47 language code (the IETF Best Current Practices on Tags for Identifying Languages).
+				BCP 47 is also known as RFC 5646. It subsumes ISO 639 and is backward compatible with it.
+			`,
+		}),
+	),
 
 	poster: t.Nullable(Image),
 	thumbnail: t.Nullable(Image),
@@ -35,4 +44,4 @@ export const Movie = t.Object({
 
 export type Movie = typeof Movie.static;
 
-Movie.examples = [bubble.movie];
+registerExamples(Movie, bubble.movie);
diff --git a/api/src/models/video.ts b/api/src/models/video.ts
index 248c7266..e8cdb9fa 100644
--- a/api/src/models/video.ts
+++ b/api/src/models/video.ts
@@ -1,30 +1,38 @@
 import { t } from "elysia";
 import { Movie } from "./movie";
-import { bubble } from "./examples";
+import { bubble, registerExamples } from "./examples";
 
 export const Video = t.Object({
 	id: t.String({ format: "uuid" }),
 	path: t.String(),
 	rendering: t.Number({ minimum: 0 }),
-	part: t.Number({ minimum: 0 }),
-	version: t.Number({ minimum: 0 }),
+	part: t.Nullable(t.Number({ minimum: 0 })),
+	version: t.Nullable(
+		t.Number({
+			minimum: 0,
+			description:
+				"Kyoo will prefer playing back the highest `version` number if there's rendering.",
+		}),
+	),
 
 	createdAt: t.String({ format: "date-time" }),
 });
 
 export type Video = typeof Video.static;
 
-Video.examples = [bubble];
+registerExamples(Video, bubble);
 
 export const CompleteVideo = t.Intersect([
 	Video,
 	t.Union([
 		t.Object({
 			movie: Movie,
+			episodes: t.Optional(t.Never()),
 		}),
 		t.Object({
 			// TODO: implement that
 			episodes: t.Array(t.Object({})),
+			movie: t.Optional(t.Never()),
 		}),
 	]),
 ]);
diff --git a/api/src/utils.ts b/api/src/utils.ts
new file mode 100644
index 00000000..b4b1ca96
--- /dev/null
+++ b/api/src/utils.ts
@@ -0,0 +1,3 @@
+// remove indent in multi-line comments
+export const comment = (str: TemplateStringsArray) =>
+	str.toString().replace(/^\s+/gm, "");