diff --git a/examples/step-by-step/sbs_swarm.py b/examples/step-by-step/sbs_swarm.py
index 3cdfa2d9f..b562ac58b 100644
--- a/examples/step-by-step/sbs_swarm.py
+++ b/examples/step-by-step/sbs_swarm.py
@@ -90,6 +90,7 @@ def run_square_sequence(scf: SyncCrazyflie):
     'radio://0/20/2M/E7E7E7E703',
     'radio://0/20/2M/E7E7E7E704',
     # Add more URIs if you want more copters in the swarm
+    # URIs in a swarm using the same radio must also be on the same channel
 ]
 
 # The layout of the positions (1m apart from each other):