diff --git a/examples/shfqc_propagation_delay.md b/examples/shfqc_propagation_delay.md
index 82f653ad..9fc3d8d4 100644
--- a/examples/shfqc_propagation_delay.md
+++ b/examples/shfqc_propagation_delay.md
@@ -34,7 +34,7 @@ device = session.connect_device("DEVXXXX")
 ### Parameter
 
 ```python
-qachannel_center_frequency = 4.1e9
+qachannel_center_frequency = 4.0e9
 qachannel_power_in = 5
 qachannel_power_out = 0