diff --git a/README.md b/README.md
index 4c607c3..94b9ee4 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,19 @@
 ucore-thumips [![Build Status](https://travis-ci.org/z4yx/ucore-thumips.svg?branch=ucore-fix)](https://travis-ci.org/z4yx/ucore-thumips)
 =============
 
+Build
+-----
+
+Build for FPGA:
+
+`make CROSS_COMPILE=<path-to-mips-mti-elf>/bin/mips-mti-elf- ON_FPGA=y -j4`
+
+Simulation
+----
+
+`make CROSS_COMPILE=<path-to-mips-mti-elf>/bin/mips-mti-elf- ON_FPGA=n qemu`
+
+More
+---
+
 See `doc` folder.