diff --git a/README.md b/README.md
index 77e8f85..16350e9 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ send emails, html and attachments (files, streams and strings) from node.js to a
 
 - auth access to an SMTP Server
 - if your service (ex: gmail) uses two-step authentication, use an application specific password
+- if using TypeScript, enable [`esModuleInterop`](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-7.html#support-for-import-d-from-cjs-from-commonjs-modules-with---esmoduleinterop) or [`allowSyntheticDefaultImports`](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-1-8.html#support-for-default-import-interop-with-systemjs)
 
 ## EXAMPLE USAGE - text only emails