diff --git a/README.md b/README.md
index d176895..c15bacf 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 KMapper
 ====
 This is a Mapper Libraly like a `ModelMapper` for `Kotlin`.  
-You can call `KFunction`(e.g. `constructor`) from `Object`.
+You can call `KFunction`(e.g. `method reference`) from `Object`.
 
 ```kotlin
 // before
@@ -39,6 +39,8 @@ class Dst(
     val arg4: Double,
     val arg5: String?
 )
+
+val newInstance = KMapper(::Dst).map(src1, src2, src3)
 ```
 
 ### Set alias on map
@@ -47,6 +49,8 @@ class Dst(
 class Src(@KGetterAlias("aliased") val str: String)
 
 class Dst(val aliased: String)
+
+val newInstance = KMapper(::Dst).map(src)
 ```
 
 #### for parameter
@@ -56,6 +60,8 @@ class Src(val str: String)
 class Dst(@param:KPropertyAlias("str") private val _src: String) {
   val src = _src.someArrangement
 }
+
+val newInstance = KMapper(::Dst).map(src)
 ```
 
 ### Convert parameter name
@@ -64,7 +70,7 @@ val srcMap = mapOf("snake_case" to "SnakeCase")
 
 class Dst(val snakeCase: String)
 
-val dst: Dst = Mapper(::DataClass) { it.toSnakeCase }.map(src)
+val dst: Dst = KMapper(::DataClass) { camelToSnake(it) }.map(src)
 ```
 
 ### Map param to another class
@@ -82,4 +88,6 @@ class CreatorClass @SingleArgCreator constructor(val arg: String) {
 class Src(val arg1: String, val arg2: Int)
 
 class Dst(val arg1: CreatorClass, val arg2: CreatorClass)
+
+val newInstance = KMapper(::Dst).map(src)
 ```