diff --git a/README.md b/README.md
index db52fa8b3c5fd7d47dfc7c048b78802a7d836aff..eaaa78b64a1c515b39c888ead9f60ec2dea852e4 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,8 @@ For more information about the QUINT workflow:
 https://quint-workflow.readthedocs.io/en/latest/ 
 
 # Usage
-Run testOOP.py outside of the PyNutil directory.
+Fill in the test.json with the path to the required input files. e.g. path to reference atlas volume, atlas label file, segmentations (from ilastik), alignment json (from QuickNII or VisuAlign)
+Then Run testOOP.py outside of the PyNutil directory to inititate the job. 
 
 ```
 from PyNutil import PyNutil