diff --git a/project.md b/project.md
index b5e1052ade132a20668944e632010bf98f6fa4a3..2e878471c552009003bcb1e3f4ddab70179a22fe 100644
--- a/project.md
+++ b/project.md
@@ -4,4 +4,6 @@ title: Final Project
 
 # CT Imaging from Scratch
 
-Welcome to my skeletal tracking page.
+## Background
+
+- [Radon Transform](http://www-math.mit.edu/~helgason/Radonbook.pdf) by Sigurdur Helgason