diff --git a/platformio.ini b/platformio.ini
index 46a6aaead..760b078d5 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -33,13 +33,13 @@ src_dir = sonoff
 ;env_default = sonoff-TW
 
 [common] ; ************************************************************
-  ; *** Esp8266 core for Arduino version 2.3.0
-;platform = espressif8266@1.5.0
-  ; *** Esp8266 core for Arduino version 2.4.0
-platform = espressif8266@1.6.0
-  ; *** Esp8266 core for Arduino version 2.4.1
+; *** Esp8266 core for Arduino version 2.3.0
+platform = espressif8266@1.5.0
+; *** Esp8266 core for Arduino version 2.4.0
+;platform = espressif8266@1.6.0
+; *** Esp8266 core for Arduino version 2.4.1
 ;platform = espressif8266@1.7.0
-  ; *** Esp8266 core for Arduino current version
+; *** Esp8266 core for Arduino current version
 ;platform = espressif8266
 
 framework = arduino