diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 0a84be595..c0ab31fc7 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -1583,7 +1583,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Learn Markdown](https://www.gitbook.com/book/gitbookio/markdown/details) - Sammy P., Aaron O. (PDF) (EPUB) (MOBI)
 
 
-### Mathematica
+### Mathematical
 
 * [Mathematica® programming: an advanced introduction](http://www.mathprogramming-intro.org) - Leonid Shifrin
 * [Power Programming with Mathematica](http://mathematica.stackexchange.com/questions/16485/are-you-interested-in-purchasing-david-wagners-power-programming-with-mathemat/22724) - David B. Wagner