diff --git a/5-Add-virtual-motors.md b/5-Add-virtual-motors.md
index b8603071753afab62e4a004c0464073345c44ef4..fa87525205c6f64e2cec5df19023bc97beaefb47 100644
--- a/5-Add-virtual-motors.md
+++ b/5-Add-virtual-motors.md
@@ -375,6 +375,8 @@ Options:
 
 #### 5.10.2 Start servery.py in a different terminal window
 
+Reminder: the port argument passed to the `-p` option must match the value of `VMC_PORT` chosen in [step 5.7.2](5-Add-virtual-motors.md#572-modify-iocshvmccmd)
+
 ```
 $ xterm -e "${SUPPORT_DIR}/motorVMC/python/server.py -p 33333" &
 ```