diff --git a/docs/必学工具/LaTeX.en.md b/docs/必学工具/LaTeX.en.md
index b207f187..4dce3d9f 100644
--- a/docs/必学工具/LaTeX.en.md
+++ b/docs/必学工具/LaTeX.en.md
@@ -18,6 +18,11 @@ Recommended learning roadmap:
 - Read the following tutorial: [Part-1], [Part-2], [Part-3]. 
 - The best way to learn LaTeX is to write an essay, but it is also a good choice to use LaTeX to finish math homework as a try. 
 
+[Overleaf]: https://www.overleaf.com
+[Part-1]: https://www.overleaf.com/latex/learn/free-online-introduction-to-latex-part-1
+[Part-2]: https://www.overleaf.com/latex/learn/free-online-introduction-to-latex-part-2
+[Part-3]: https://www.overleaf.com/latex/learn/free-online-introduction-to-latex-part-3
+
 Here are some other recommended materials for getting started: 
 
 - A short LaTeX introduction on [[GitHub](https://github.com/OsbertWang/install-latex-guide-zh-cn)] or TEX Live guide [[PDF]( https://www.tug.org/texlive/doc/texlive-en/texlive-en.pdf)] can help you with the installing and setting up process.