diff --git a/plot_transmission_timeline.py b/plot_transmission_timeline.py
index 15646a0..641c009 100755
--- a/plot_transmission_timeline.py
+++ b/plot_transmission_timeline.py
@@ -214,6 +214,7 @@ if __name__ == "__main__":
     host.plot(transmission_df["goodput_rolling"], "-", color="blue", label="goodput")
     host.set_xlabel("datetime")
     host.set_ylabel("goodput [Mbps]")
+    host.set_ylim([0, 500])
 
     # additional y axes
     par11 = host.twinx()