diff --git a/platformio.ini-example b/platformio.ini-example
index 027670d7b..90b3fda9f 100644
--- a/platformio.ini-example
+++ b/platformio.ini-example
@@ -18,6 +18,7 @@ arduino_core_2_4_2 = espressif8266@1.8.0
 arduino_core_2_5_0 = espressif8266@2.0.4
 arduino_core_2_5_1 = espressif8266@2.1.1
 arduino_core_2_5_2 = espressif8266@2.2.1
+arduino_core_dev = https://github.com/platformio/platform-espressif8266.git
 arduino_core_latest = espressif8266
 
 [env]