diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c707183..dae0edf 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -29,8 +29,8 @@ series [How to Contribute to an Open Source Project on GitHub][egghead]
 ## Committing and Pushing changes
 
 Please make sure to run the tests before you commit your changes. You can run
-`npm run test:update` which will update any snapshots that need updating. Make
-sure to include those changes (if they exist) in your commit.
+`npm run test` which will update any snapshots that need updating. Make sure to
+include those changes (if they exist) in your commit.
 
 ## Help needed
 
diff --git a/src/types.d.ts b/src/types.d.ts
index 3709394..dcb19dc 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -204,4 +204,4 @@ type MDXExportFunction<
 > = (
   code: string,
   globals?: Record<string, unknown>,
-) => MDXExport<ExportedObject, Frontmatter>
+) => ReturnType<MDXExport<ExportedObject, Frontmatter>>