diff --git a/a-practical-introduction-to-functional-programming/README.md b/a-practical-introduction-to-functional-programming/README.md
index 34e3f0f..f315908 100644
--- a/a-practical-introduction-to-functional-programming/README.md
+++ b/a-practical-introduction-to-functional-programming/README.md
@@ -282,7 +282,7 @@ while time:
     for i in range(len(car_positions)):
         # move car
         if random() > 0.3:
-        car_positions[i] += 1
+            car_positions[i] += 1
 
         # draw car
         print '-' * car_positions[i]