diff --git a/README.md b/README.md
index 25f636d..f83ea95 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,8 @@ Feel free to reuse parts or the whole code if you want.
 Use this version if it does not compile.
 
 ### Default FLASH Options (for the Arduino IDE) :
-![](http://82.64.196.164/images/git/flash_option.png)
+![](http://82.64.196.164/images/git/flash_option.png)  
+<img src="/git/KmWikiImage/attention.png" alt="Attention" width="50" /> **For OTA update to work properly, do not use V2 lower memory LwIP Variant, use the V2 lower memory (no features) LwIP Variant instead !**
 
 ### I2C Hardware addresses :
 * OLED screen : 0x3C