diff --git a/black_scholes_model.py b/black_scholes_model.py
index 93d2e0d..e9e0f71 100644
--- a/black_scholes_model.py
+++ b/black_scholes_model.py
@@ -36,4 +36,4 @@ def black():
 
 
 if __name__ == "__main__":
-    back()
+    black()