diff --git a/readme.txt b/readme.txt
index edce578..4b2b2d4 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,3 +1,24 @@
+/*
+  fix DevNonce issue
+  
+=============   DevNonce =========
+
+Middleware/LoRaWAN/soft-se.c
+
+L1426
+#if (defined( LORAMAC_VERSION ) && ( LORAMAC_VERSION == 0x01000300 )||defined(YUNHORN_STS_RANDOM))
+
+secure-element.h
+L268
+#if ((defined( LORAMAC_VERSION ) && ( LORAMAC_VERSION == 0x01000300 ))||(defined(YUNHORN_STS_RANDOM)))
+
+LoRaMacCrypto.h
+L57
+#define USE_RANDOM_DEV_NONCE                        1
+
+*/
+
+
 /**
   *******************************************************************************
   * @file    Vibration Sensor for Consumer Product Detection and                *