diff --git a/logistics.py b/logistics.py
index ee35ef1..ced45aa 100644
--- a/logistics.py
+++ b/logistics.py
@@ -2,7 +2,7 @@
 # coding: utf-8
 import numpy as np
 import matplotlib.pyplot as plt
-
+# hello
 def draw(x1, x2):
     ln = plt.plot(x1, x2,'-')
     plt.pause(0.0001)