diff --git a/README.md b/README.md
index 2762dc9..bc0aea0 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+Use ESP8266 2.5.0 version for this project.
+
 # IOT-Light-Dimmer
 IOT-Light-Dimmer