diff --git a/free-programming-books.md b/free-programming-books.md
index 5ebe351b98b29c5c2da0ac7631c295edbcfcbd4a..93e034dd974f00960e3ae5d8e0b54893426d72e5 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -922,6 +922,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 * [256-Color VGA Programming in C](http://www.brackeen.com/vga/) - David Brackeen
 * [A Tutorial on Pointers and Arrays in C](http://home.netcom.com/~tjensen/ptr/pointers.htm) - Ted Jensen [(PDF, Zipped HTML)](http://pweb.netcom.com/~tjensen/ptr/cpoint.htm)
+* [An Introduction to C & GUI Programming](https://www.raspberrypi.org/magpi-issues/C_GUI_Programming.pdf) - Simon Long (PDF)
 * [Bare-metal programming for ARM](https://github.com/umanovskis/baremetal-arm) - Daniels Umanovskis [(PDF)](http://umanovskis.se/files/arm-baremetal-ebook.pdf)
 * [Beej's Guide to C Programming](http://beej.us/guide/bgc/) - B. Hall
 * [Beej's Guide to Network Programming - Using Internet Sockets](http://beej.us/guide/bgnet/) - B. Hall