diff --git a/setup_osx.py b/setup_osx.py
index e57f6e31..bbb3749f 100644
--- a/setup_osx.py
+++ b/setup_osx.py
@@ -1,6 +1,6 @@
 """
-Usage:
-    python setup.py py2app
+Command to create a macOS app bundle:
+    PYTHONPATH=. python3 setup_osx.py py2app
 """
 
 import os