diff --git a/README.md b/README.md
index 7e90183..b51230f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,10 @@
-# cs850_multiarch_bs
+## cs850_multiarch_bs
 Minimal bootstrap code for x86, Sparc and MIPS
+
+
+## x86:
+Run "make" in "x86" directory.
+
+The boot image "boot.img" is generated under "out" directory.
+
+Use QEMU or Bochs to emulate.