diff --git a/free-programming-books.md b/free-programming-books.md
index 3b11bbcecda03f7305f5c3feb656be0c677943e1..014f948471ba90c2ec03ccba8f96eae3a16efff2 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -2410,6 +2410,7 @@ Kerridge (PDF) (email address *requested*, not required)
 #### Flask
 
 * [Explore Flask](https://exploreflask.com) - Robert Picard
+* [Flask Documentation](https://flask.palletsprojects.com) - Pallets (:construction: *in process*)
 * [The Flask Mega-Tutorial](http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world) - Miguel Grinberg (0.9)