diff --git a/README.md b/README.md
index 4d1b3dc..3e256fa 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@
 
 > [!CAUTION]
 > EEPROM Emulation Library may not be suitable for frequent data alterations.
+> It is not working on Dual pages Sector-Base Address ( STM32F429II ...)
 ---
 This library facilitates EEPROM emulation on microcontrollers by selecting the latest sector or page for emulation space.
 ## Tested List: