README.md in canoser-0.1.0 vs README.md in canoser-0.1.1

@@ -112,11 +112,11 @@
 ```ruby
   class Map1 < Canoser::Struct
     define_field :addr, {}
   end
   class Map2 < Canoser::Struct
-    define_field :addr, {[Canoser::Uint8], [Canoser::Uint8]}
+    define_field :addr, {[Canoser::Uint8] => [Canoser::Uint8]}
   end  
 ```  
 
 ### Nested data structure
 The following is a complex example with three data structures:
@@ -144,14 +144,24 @@
 
 ### Serialization and deserialization
 After defining Canoser::Struct, you don't need to implement serialization and deserialization code yourself, you can directly call the default implementation of the base class. Take the AccountResource structure as an example:
 
 ```ruby
-#序列化
+# serialize an object
 obj = AccountResource.new(authentication_key:[...],...)
 bytes = obj.serialize
-#反序列化
+
+# deserialize an object form bytes
 obj = AccountResource.deserialize(bytes)
+```
+
+### Get field value form object 
+For all fields defined by the "define_field" method, the value of this field of an object can be obtained via [field_name]. such as:
+
+```ruby
+obj[:authentication_key]
+#or
+obj["authentication_key"]
 ```
 
 
 ## Development