diff --git a/README.md b/README.md
index ee6fe352834c1c05a86fdd82f89f2599887fb4b0..55e9c9f46b35f0078577c4874c477cbc7bba315e 100644
--- a/README.md
+++ b/README.md
@@ -212,7 +212,7 @@ acmc phen copy -v v1.0.3
 	Use the following `acmc` command to compare the previous version (`v1.0.3`) with the latest version in the repository:
 
 ```bash
-python acmc.py phen diff -old ./workspace/v1.0.3/
+acmc phen diff -old ./workspace/v1.0.3/
 ```
 
 10. **Publish the phenotype at the next version**