diff --git a/README.md b/README.md
index 434c2ba..564bb78 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,11 @@ Keywords: Geodesic cycle, Exponential random graph model, ERGM, dk-series random
 
 ## Code and scripts
 
-The code and scripts in this repository were imported from the geodesic_cycles_code_scripts.tar.gz file available from https://sites.google.com/site/alexdstivala/home/geodesic_cycles.
+The code and scripts in this repository were originally imported from the geodesic_cycles_code_scripts.tar.gz file available from https://sites.google.com/site/alexdstivala/home/geodesic_cycles.
 
-The code for counting geodesic cycles uses the Waffles machine learning library https://github.com/mikegashler/waffles.
+The code for finding "atomic cycles" uses the Waffles machine learning library https://github.com/mikegashler/waffles.
+
+The code for counting geodesic cycles uses the CYPATH software from http://research.nii.ac.jp/~uno/code/cypath11.zip (see http://research.nii.ac.jp/~uno/code/cypath.html) to find chordless cycles.
 
 ## References