diff --git a/0.9.2/512k-flash/nodemcu_512k.bin b/0.9.2/512k-flash/nodemcu_512k.bin
index 65a70e58..902806a7 100644
Binary files a/0.9.2/512k-flash/nodemcu_512k.bin and b/0.9.2/512k-flash/nodemcu_512k.bin differ
diff --git a/README.md b/README.md
index cdf5f0e1..0da4c826 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,10 @@
 # **NodeMcu** #
 ###A lua based firmware for wifi-soc esp8266
-version 0.9.2 build 2014-12-07
+version 0.9.2 build 2014-12-08
 # Change log
+2014-12-08<br />
+add uart.setup(), uart.write() api.<br />
+
 2014-12-07<br />
 add ow(1-wire module), from arduino, and use same api.<br />
 add an 18b20 1-wire example.<br />