diff --git a/free-programming-books.md b/free-programming-books.md
index f43bcdb8a..a3f0e7ac3 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -94,6 +94,7 @@
 * [Linux](#linux)
 * [Lisp](#lisp)
 * [Lua](#lua)
+* [MarkDown](#markdown)
 * [Mathematica](#mathematica)
 * [MATLAB](#matlab)
 * [Maven](#maven)