diff --git a/Zigbee.md b/Zigbee.md
index f5c81116..ceaf3867 100644
--- a/Zigbee.md
+++ b/Zigbee.md
@@ -76,7 +76,7 @@ Insert alternating male Dupont jumpers; one jumper on one side, the next one on
 ### C. Upload the firmware to the CC2530
 The CC2530 requires `Z-Stack_Home_1.2`, of type `Default` (not `Source Routing`). For convenience, ready to use [firmware files](https://github.com/s-hadinger/CCLib/tree/master/Bin) are provided. Select the right one for your hardware: `CC2530`, `CC2530 + CC2591` or `CC2530 + CC2592`.
 
-1. Ensure that you have Python 2.7 installed
+1. Ensure that you have Python 2.7 installed. Note that these instructions do not work for Python 3.x
 2. Install pyserial 3.0.1:  
    `pip install pyserial==3.0.1`
 3. Check for connectivity before flashing: