diff --git a/scripts/generate-types.js b/scripts/generate-types.js
index 98d5c7164..f1f783095 100644
--- a/scripts/generate-types.js
+++ b/scripts/generate-types.js
@@ -2,7 +2,7 @@ import { readdir, mkdir, rm, writeFile, copyFile } from "node:fs/promises";
 import { basename } from "node:path";
 
 import * as prettier from "prettier";
-import openapiTS from "openapi-typescript";
+import openapiTS, { astToString, COMMENT_HEADER } from "openapi-typescript";
 
 if (!process.env.OCTOKIT_OPENAPI_VERSION) {
   throw new Error("OCTOKIT_OPENAPI_VERSION is not set");
@@ -87,9 +87,15 @@ type Repository = components["schemas"]["full-repository"]
 
     await writeFile(
       `packages/${packageName}/types.d.ts`,
-      await prettier.format(await openapiTS(`cache/${name}.json`), {
-        parser: "typescript",
-      }),
+      await prettier.format(
+        COMMENT_HEADER +
+          astToString(
+            await openapiTS(new URL(`../cache/${name}.json`, import.meta.url)),
+          ),
+        {
+          parser: "typescript",
+        },
+      ),
     );
     console.log(`packages/${packageName}/types.d.ts written`);
   }