modified: README.md

README.md

 WKF!? - What the Kinematic Fit
 ==============================
 
-Introduction and Background
-===========================
+## Introduction and Background
 
 This started as a side project to implement kinematic fitting while learning 
 some modern template meta programming techniques. It uses [strong 
@@ -74,7 +73,9 @@ auto fitter = wkf::ProblemBuilder()
 
 
 
-## Test data
+## Motivation and Test data
+
+The motivation for this project was to mirror the [original implementation from Frank Cao](https://gitlab.com/franktcao/FCKinFitter). 
 
 ```
 wget -P dataIn/ https://userweb.jlab.org/~fcao/data/root/eg6/pass_kinfitv2/eg6_coh_dvcs_pass_fit_plus_3000.root