diff --git a/plot_transmission_timeline.py b/plot_transmission_timeline.py
index 7dbdb10..268e09f 100755
--- a/plot_transmission_timeline.py
+++ b/plot_transmission_timeline.py
@@ -156,7 +156,7 @@ if __name__ == "__main__":
     )
 
     # remove all not needed columns
-    transmission_df = transmission_df.filter(["goodput", "datetime"])
+    transmission_df = transmission_df.filter(["goodput", "datetime", "ack_rtt"])
 
     # read serial csv
     serial_df = pd.read_csv(args.serial_file)