diff --git a/old_projects/complex_multiplication_article.py b/old_projects/complex_multiplication_article.py
index 6fa8d006..f3144511 100644
--- a/old_projects/complex_multiplication_article.py
+++ b/old_projects/complex_multiplication_article.py
@@ -15,6 +15,7 @@ from topics.complex_numbers import *
 
 DEFAULT_PLANE_CONFIG = {
     "stroke_width" : 2*DEFAULT_POINT_THICKNESS
+    }
 
 
 class SuccessiveComplexMultiplications(ComplexMultiplication):