diff --git a/docs/Compiling.md b/docs/Compiling.md
index 46e991f..11ec372 100644
--- a/docs/Compiling.md
+++ b/docs/Compiling.md
@@ -13,7 +13,7 @@ The procedure below will guide you through all the steps to upload successfully
 ## Upload the firmware
 
 ###Material you need to upload the firmware
-1. USBASP programmer supporting 3.3V: <img src="images/USBasp_Programmer.jpeg" width="200" height="200" /> [(example aliexpress link)](https://www.aliexpress.com/item/USBasp-USB-ISP-3-3V-5V-AVR-Programmer-USB-ATMEGA8-ATMEGA128-New-10PIN-Wire-Support/2036402518.html?spm=2114.30010308.8.10.jIbHzs)
+1. USBASP programmer supporting 3.3V: <img src="images/USBasp_Programmer.jpeg" width="200" height="200" /> [(example aliexpress link)](https://www.aliexpress.com/item/USBasp-USB-ISP-3-3V-5V-AVR-Programmer-USB-ATMEGA8-ATMEGA128-New-10PIN-Wire-Support/2036402518.html?spm=2114.30010308.8.10.jIbHzs). There are reports that some of the cheap programmers are not safe to use with 3.3V units, usually the black PCB versions are ok.
 1. 10pin to 6pin adapter: <img src="images/10pin_2_6pin.JPG" width="150" height="150" /> [(example ebay link)](http://www.ebay.fr/itm/10-Pin-a-6-Pin-Carte-Adaptateur-M-F-pour-AVRISP-USBASP-STK500-Noir-Bleu-WT-/291862396761?hash=item43f45abf59:g:gXsAAOSwMgdXyGnh)
 1. 6 pin header like this one: <img src="images/6pin_header.jpg" width="100" height="100" /> [(example Digi-Key link)](http://www.digikey.com/products/en?keywords=3M%20961206-6404-AR)