diff --git a/code/utility.py b/code/utility.py
index 6179a7b..5a55632 100644
--- a/code/utility.py
+++ b/code/utility.py
@@ -1,8 +1,8 @@
 import numpy as np
 
 
-def zero_crossing(eod)
-threshold = 0;
-shift_eod = np.roll(eod, 1)
-eod_times = time[(eod >= threshold) & (shift_eod < threshold)]
-return eod_times
+def zero_crossing(eod,time):
+	threshold = 0;
+	shift_eod = np.roll(eod, 1)
+	eod_times = time[(eod >= threshold) & (shift_eod < threshold)]
+	return eod_times