diff --git a/README.md b/README.md
index 943c13e..80c1890 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # Nasal Interpreter
 
-# Nasal
+# Nasal script language
 
-Nasal is a script language that used in FlightGear.
+[Nasal](http://wiki.flightgear.org/Nasal_scripting_language) is a script language that used in [FlightGear](https://www.flightgear.org/).
 
 There is a Nasal console in FlightGear but sometimes it is not so easy for every developer to use.
 
@@ -10,31 +10,27 @@ So this is an interpreter for Nasal written by C++.
 
 The interpreter is still in development.Anyone who interested in this could also join us!
   
-  # Now complete Lexical Analysis!
+# Lexical Analysis
   
-  What do it's outputs look like?
+What do it's outputs look like?
   
-( Identifier  | engineTimer )
+> ( identifier   | engineTimer )
 
-( Operator    | . )
+> ( operator     | . )
 
-( Identifier  | start )
+> ( identifier   | start )
 
-( Operator    | ( )
+> ( operator     | ; )
 
-( Operator    | ) )
+> ( reserve word | print )
 
-( Operator    | ; )
+> ( operator     | ( )
 
-( ReserveWord | print )
+> ( string       | Engine started )
 
-( Operator    | ( )
+> ( operator     | ) )
 
-( String      | "Engine started" )
-
-( Operator    | ) )
-
-( Operator    | ; )
+> ( operator     | ; )
 
 This is what it outputs.
 
@@ -44,38 +40,38 @@ After many times of failure,i finally try to use PDA to do the parse work.
 
 But something occurred,so i finally didn't make it.However you can still see this LL(1) and LR(0) parser in version 0.7 & 0.9
 
-# Now complete Parser
+# Parser
 
 The parser can recognize some basic elements in resource program.
 
-In version 1.1 you can use the fully-functional parser.
+In __version 1.1__ you can use the fully-functional parser.
 
 But there are still some differences such as:
 
+```javascript
 (var a,b,c)=(1,2,3);
-
 var (r,g,b)=color;
-
 (a,b)=(b,a);
+```
 
 etc. cannot be recognized.
 
-And each statement must have a ';' after it or you will be informed with 'error: expect a ';''.
+And each statement must have a ';' after it or you will be informed with __'error: expect a ';''__ .
 
 # Calculator
 
-You can try a calculator in version 0.17~0.19 !
+You can try a calculator in __version 0.17~0.19__ !
 
-# Now complete Abstract Syntax Tree
+# Abstract Syntax Tree
 
-In version 1.2 the ast has been completed.
+In __version 1.2__ the ast has been completed.
 
 But there are still some bugs inside.
 
 # Balloon script
 
-Balloon is created for experiment.
+[Balloon](https://github.com/ValKmjolnir/Balloon-script) is created for experiment.
 
-It is a subset of Nasal and the parse is stricter than Nasal parse.
+It is a subset of Nasal and the parser is __stricter__ than Nasal parser.
 
 Explore the usage of balloon and enjoy yourself! XD