diff --git a/check_bandwidth.py b/check_bandwidth.py
index 682cf22..76a58f5 100755
--- a/check_bandwidth.py
+++ b/check_bandwidth.py
@@ -13,6 +13,7 @@ parser = argparse.ArgumentParser(description='Check network interface bandwidth
 parser.add_argument('--bandwidth', type=float, required=True, help='Bandwidth speed in Mbps.')
 parser.add_argument('--critical', type=int, default=75, help='Critical if percent of bandwidth usage is greater than or equal to this.')
 parser.add_argument('--warn', type=int, default=50, help='Warning if percent of bandwidth usage is greater than or equal to this.')
+parser.add_argument('--max', type=int, default=None, help='Set the max value the bandwidth can be. Useful for graphs and whatever.')
 args = parser.parse_args()
 
 
@@ -61,7 +62,7 @@ def main():
         else:
             ok.append(interface)
             data[i][2] = 'ok'
-        perf_data.append(f'{interface}={round(bandwidth_utilization, 2)}MB;{warn_value};{crit_value}; ')
+        perf_data.append(f'{interface}={round(bandwidth_utilization, 2)}MB;{warn_value};{crit_value};{f"0;{args.max};" if args.max else ""} ')
 
     if len(ok):
         print(f'OK: {", ".join(ok)}')