update README

README

@@ -5,7 +5,7 @@ Created by Nguyen Anh Quynh, then developed and maintained by a small community,
 Capstone offers some unparalleled features:
 
 - Support multiple hardware architectures: ARM, ARM64 (ARMv8), Mips, PPC, Sparc,
-  SystemZ, XCore and X86.
+  SystemZ, XCore and X86 (including X86_64).
 
 - Having clean/simple/lightweight/intuitive architecture-neutral API.
 
@@ -35,6 +35,10 @@ Further information is available at http://www.capstone-engine.org
 See COMPILE.TXT file for how to compile and install Capstone.
 
 
+[Documentation]
+See docs/README for how to customize & program your own tools with Capstone.
+
+
 [Hack]
 
 See HACK.TXT file for the structuture of the source code.