more notes for HACK
diff --git a/HACK b/HACK
index d9767c0..568d720 100644
--- a/HACK
+++ b/HACK
@@ -1,31 +1,33 @@
 Capstone source is organized as followings.
 
+
 .                   <- core engine + README + COMPILE etc
 ├── arch            <- code handling disasm engine for each arch
-│   ├── AArch64     <- ARM64 (aka ARMv8) code
-│   ├── ARM         <- ARM code
-│   ├── Mips        <- Mips code
-│   └── X86         <- X86
+│   ├── AArch64     <- ARM64 (aka ARMv8) engine
+│   ├── ARM         <- ARM engine
+│   ├── Mips        <- Mips engine
+│   └── X86         <- X86 engine
 ├── bindings        <- all bindings are under this dir
 │   ├── csharp      <- C# bindings + test code
 │   ├── java        <- Java bindings + test code
 │   ├── ocaml       <- Ocaml bindings + test code
 │   ├── python      <- Python bindings + test code
 │   └── ruby        <- Ruby bindings + test code
-├── include         <- API headers in C (*.h)
+├── include         <- API headers in C language (*.h)
 ├── release         <- Precompiled binaries
 │   ├── linux       <- .deb, .rpm, python packages, etc
 │   ├── mac         <- .dmg
 │   └── windows     <- .msi, .exe, .dll, etc
-├── tests           <- Test code (in C)
+├── tests           <- Test code (in C language)
 
 
 Follow COMPILE to see how to compile and run code.
 
-Note: if you find some bugs during compilation, it is recommended to clean
-the code and try again, for example with:
+Note: if you find some strange bugs, it is recommended to firstly clean
+the code and try to recompile/reinstall again. This can be done with:
 
 	$ make clean
 	$ make
+	$ sudo make install