diff --git a/rad_tag.py b/rad_tag.py
index 470d13b..a60dd7b 100755
--- a/rad_tag.py
+++ b/rad_tag.py
@@ -57,7 +57,7 @@ with open(args.csv, "r") as f:
     csv = csv.reader(filter(lambda row: row[0] != '#', f), 
                      delimiter=',', skipinitialspace=True)
 
-    # Import only relevant values, thats timestamp and CP/M
+    # Import only relevant values, that's timestamp and CP/M
     for _, csv_raw_time, csv_raw_cpm, _ in csv:
         radiation = Radiation(csv_raw_time, csv_raw_cpm, local_timezone, args.sifactor)
         radiation_list.append(radiation)