diff --git a/tools/count_slot_usage.py b/tools/count_slot_usage.py
index e6245a22..11c6c1e0 100755
--- a/tools/count_slot_usage.py
+++ b/tools/count_slot_usage.py
@@ -47,7 +47,7 @@ def main():
 
     print("Day\tUTC Hour")
     available_slots = 2 * len(CHANNELS)
-    full_time_slot = available_slots - 1
+    full_time_slot = available_slots - args.sensitivity
     for day in WEEKDAYS:
         for hour in range(24):
             slot_usage = len(meeting_counts[hour][day])
@@ -162,6 +162,11 @@ def parse_args():
     parser.add_argument(
         '--csv', metavar='FILE_NAME',
         help='If specified, write counts to the specified CSV file')
+    parser.add_argument(
+        '--sensitivity', type=int, default=1,
+        help='Sensitivity of reporting. '
+             'Defaults to 1, which means report if no weekly slot is '
+             'available at the time slots considered.')
 
     args = parser.parse_args()
     return args