diff --git a/sydney_tides.py b/sydney_tides.py
index 151b098..aea3f94 100644
--- a/sydney_tides.py
+++ b/sydney_tides.py
@@ -27,7 +27,7 @@ import math
 START_TIME = '2020-01-01'
 END_TIME = '2020-12-31'
 OUTPUT_NAME = 'levels.csv'
-MSL = 0.9952 
+MSL = 0.9952
 
 harm = {}
 speed = 0
@@ -258,3 +258,5 @@ while (t < end_time):
     x.append(t)
     y.append(z)
     t = t + time_step
+
+F.close()