diff --git a/src/index.ts b/src/index.ts
index 20a078de..f96ac525 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -68,6 +68,10 @@ export interface Options {
    * A [Prettier](https://prettier.io/docs/en/options.html) configuration.
    */
   style: PrettierOptions
+  /**
+   * TODO: info
+   */
+  tsTypes: Record<string, string>,
   /**
    * Generate code for `definitions` that aren't referenced by the schema?
    */
@@ -103,6 +107,7 @@ export const DEFAULT_OPTIONS: Options = {
     trailingComma: 'none',
     useTabs: false,
   },
+  tsTypes: {},
   unreachableDefinitions: false,
   unknownAny: true,
 }