diff --git a/README.md b/README.md
index 436db09..5cf3247 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,108 @@
 # Spark Model Helper
- Extracting useful information from trained Spark Model
+
+A helper that extracting useful information from trained Spark Model
+
+Have you tired staring at the model.toDebugString() for hours and getting no clue at all? Something like this:
+```text
+DecisionTreeClassificationModel (uid=dtc_e933455b) of depth 5 with 341 nodes
+  If (feature 518 <= 1.5)
+   If (feature 6 <= 2.5)
+    If (feature 30 <= 20)
+     If (feature 45 <= 7)
+      If (feature 24 <= 2.5)
+        ...
+      Else (feature 160 > 0.99)
+      If (feature 64 <= 3.5)
+       Predict: 0.0
+      Else (feature 64 > 3.5)
+       Predict: 1.0
+```
+Well now you have this helper designed for HUMAN, which matters.
+
+## Usage:
+
+### **DecisionTreeClassificationModel Analysis**
+***
+
+#### _1. Get Root Feature Index from trained model_
+
+In automated ML, sometimes you need to retrain model due to the scalar metric as evaluation result (precision and recall
+for instance) are not within a desired range. By using rootFeatureIndex we can change the dataframe accordingly.
+
+```scala
+  val helper = new DecisionModelHelper(model)
+  println("Root Feature Index: " + helper.getRootFeature)
+```
+
+#### _2. Get the JSON string from DecisionTreeClassificationModel_
+
+```scala
+  val helper = new DecisionModelHelper(model)
+  println("toJson: " + helper.toJson + "\n")
+```
+
+Return beatified JSON string:
+
+```json
+    {
+      "featureIndex": 367,
+      "gain": 0.10617781879627633,
+      "impurity": 0.3144732024264778,
+      "threshold": 1.5,
+      "nodeType": "internal",
+      "splitType": "continuous",
+      "prediction": 0.0,
+      "leftChild": {
+        ....
+      "path": "F(367)|0.3144732024264778|0.0|1.5|"
+    }
+```
+
+### _3. Return an Object of Model Node-Tree_
+
+```scala
+    val nodeObj = helper.getDecisionNode
+    println("getDecisionNode: " + nodeObj)
+```
+
+Object version of JSON String
+
+### _4. Return Root to Leaf Path of Rules_
+
+```scala
+    val rules = helper.getRulesList(1, 0.2)
+    rules.foreach(rule => {
+      println("Rule: " + rule.mkString(", "))
+    })
+```
+The above code prints:
+```text
+    Rule: F(396)|0.3144732024264778|0.0|1.5|L, F(12)|0.49791192623975383|1.0|2.5|R, F(223)|0.2998340735773348|1.0|2500000.0|R, F(20)|0.19586076183802947|1.0|3.523971665E10|L, None|0.1902980108641974|1.0|None|E
+```
+The function returns List[List[String]], the structure of each String is
+```text
+    Feature_Index | impurity | prediction | threshold | node_type
+```
+For example, Feature Index **45** has impurity **3.5**, prediction **1**, threshold **1.5** and the path goes **right** after this node, the string will be:
+```text
+    F(45)|3.5|1|1.5|R
+```
+The Leaf nodes will have **"E"** as node_type
+
+### _5. Customise the Feature_Index_
+Feature Index is not designed for human reading, especially with large amount of columns.
+The helper also supports customisation of Features
+```scala
+  val helper = new DecisionModelHelper(model)
+    helper.setFeatureName(
+      Map(0 -> "UserID", 1 -> "UserCity", 2 -> "Salary" ... )
+    )
+```
+The helper automatically change the F(1) into "UserCity" upon called setFeatureName(Map[Int, String])
+```text
+    F(1)|3.5|1|1.5|R
+```
+will output as 
+```text
+    UserCity|3.5|1|1.5|R
+```
\ No newline at end of file
diff --git a/build.sbt b/build.sbt
index 3b9ae02..6f1306a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,13 +1,14 @@
 import sbt.Keys.libraryDependencies
 
-ThisBuild / version := "1.1.0-SNAPSHOT"
-
+ThisBuild / version := "1.1.0"
+ThisBuild / versionScheme := Some("pvp")
 ThisBuild / scalaVersion := "2.12.15"
 
+
 lazy val root = (project in file("."))
   .settings(
     name := "SparkModelHelper",
-    idePackagePrefix := Some("io.github.RaistlinTao"),
+    idePackagePrefix := Some("io.github.raistlintao"),
     // https://mvnrepository.com/artifact/net.liftweb/lift-json
     libraryDependencies += "net.liftweb" %% "lift-json" % "3.5.0",
     // https://mvnrepository.com/artifact/com.alibaba/fastjson
diff --git a/src/test/scala/Usage.scala b/src/test/scala/Usage.scala
index b6d4a65..42bd10d 100644
--- a/src/test/scala/Usage.scala
+++ b/src/test/scala/Usage.scala
@@ -13,14 +13,10 @@ object Usage {
     println("toDebugString:" + model.toDebugString + "\n")
     val helper = new DecisionModelHelper(model)
     helper.setFeatureName(
-      Map(0 -> "F0", 1 -> "F1", 2 -> "F0", 3 -> "F1", 4 -> "F0", 5 -> "F1", 6 -> "F0", 7 -> "F1", 8 -> "F0", 9 -> "F1",
-        10 -> "DSF", 11 -> "ZCX", 12 -> "CSD", 13 -> "GF", 14 -> "F0", 15 -> "F1", 16 -> "F0", 17 -> "F1", 18 -> "F0", 19 -> "F1",
-        20 -> "SC", 21 -> "CZX", 22 -> "KJL", 23 -> "GF", 24 -> "FG", 25 -> "F1", 26 -> "FFG0", 27 -> "GF1", 28 -> "FM0", 29 -> "FV1",
-        30 -> "CZX", 31 -> "XCZ", 32 -> "HGJ", 33 -> "BB", 34 -> "F0", 35 -> "F1", 36 -> "F0", 37 -> "FA1", 38 -> "F0V", 39 -> "FV1",
-        40 -> "XZ", 41 -> "XC", 42 -> "HGJ", 43 -> "BB", 44 -> "F0", 45 -> "F1", 46 -> "F0D", 47 -> "F1A", 48 -> "FV0", 49 -> "FV1",
-        50 -> "CZ", 51 -> "CX", 52 -> "HN", 53 -> "GG", 54 -> "F0", 55 -> "F1", 56 -> "F0", 57 -> "F1"
-      )
+      Map(0 -> "F0", 1 -> "F1", 2 -> "F0", 3 -> "F1", 4 -> "F0")
     )
+    val root_feature_index = helper.getRootFeature
+    println("Root Feature Index: " + root_feature_index)
     val jsonStr = helper.toJson
     println("toJson: " + jsonStr + "\n")
     val nodeObj = helper.getDecisionNode