diff --git a/README.md b/README.md
index 703bea8..60240bd 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,8 @@ Arduino based project running on my custom made board
     * GPIO12 --> MISO
     * GPIO14 --> CLK
     * GPIO2 --> µSDCard CHIP_SELECT
+* FLASH_BTN
+    * GPIO 0
 
 ## Here is a list of the components needed in order to build such a board :
 * 1x 1N4001 reverse voltage protection diode