diff --git a/JavaScript.md b/JavaScript.md
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@@ -1,2 +1,6 @@
 -  [Just.js](https://github.com/just-js/just)
-- [TypeScript JSDoc](https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html)
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+- [TypeScript JSDoc](https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html)
+
+## TypeScript
+
+- [Why doesn't TypeScript properly type Object.keys?](https://alexharri.com/blog/typescript-structural-typing) te enseña sobre algo básico de TypeScript (structural typing) y como usarlo para escribir código más limpio.
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