modified: README.md

	new file:   tracking_geometry.png

README.md

@@ -111,9 +111,16 @@ Artifacts can be browsed via the web interface, for example, the latest in recon
 
 "[Acts](https://acts.readthedocs.io/en/latest/) is an experiment-independent toolkit for (charged) particle track reconstruction in (high energy) physics experiments implemented in modern C++."
 
+#### ACTS References:
+
 #### The ACTS way of tracking
 
-First, the geometry has to be constructed.  Assuming this is already done, we describe the data processing.
+First, the geometry has to be constructed. Currently the ACTS geometry is constructed and tested as part of the athena pipeline.
+The tracking surfaces can be viewed in a cad program using the output `tracking_geometry.obj` file the reconstruction_benchmarks pipeline.
+
+![tracking geometry](tracking_geometry.png)
+
+Assuming this is already done, we describe the data processing.
 
 ##### Source Links and Measurements
 
@@ -139,6 +146,8 @@ A Kalman filter needs a starting point and those are the `Initial Track Paramete
 Conceptually the process of determining these parameters begins with track seeding.
 
 
+ACTS has a Combinatorial Kalman Filter (CKF) which does both track finding and fitting.  
+
 
 ### GenFit2
 
@@ -146,3 +155,4 @@ Conceptually the process of determining these parameters begins with track seedi
 
 
 
+