diff --git a/update.md b/update.md
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--- a/update.md
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@@ -10,6 +10,9 @@
 
 # 更新说明
 
+## 2019.08.31   // **2.0 RC2 U4 ( Kernel & Firmware ) UPDATE Published.**
+1. 基于树莓派硬件定制并优化GCC(gcc-9.1.0-64)交叉编译工具链重新编译 Kernel 4.19.69-OPENFANS+20190902-v8 LTS 内核及固件同步主线4.19.69
+
 ## 2019.08.31   // **2.0 RC2 U4 ( Kernel & Firmware ) UPDATE Published.**
 1. Kernel upgrade to Mainline 4.19.69-OPENFANS+20190831-v8 LTS, 内核及固件更新至主线4.19.69