diff --git a/README.md b/README.md
index 907acee..53052b2 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,13 @@ Retrieve or display given a process tree
 
     `npm install -g proctree`
 
+## Functions 
+
+  * `getProcessTree(pid)` to get process tree information
+  * `getpids(pid)` to get process ids only in an array format
+  * `show(pid)` to see process trees in a text format
+  * `treeKill(pid)` to kill all processes in the process tree
+
 ## Usage With Bash Shell: 
     
     $ pstree 89982
@@ -52,4 +59,7 @@ Retrieve or display given a process tree
 
    > PsTree.getPids(32034)
      [ [ '32034' ], [ '32038' ], [ '32039' ], [ '32040' ], [ '32045', '32048', '32050' ] ]
+
+   > PsTree.treeKill(32034)
+     'killed 47673 47671 47668 47664 47663 47662 47658'
 ```
diff --git a/index.js b/index.js
index 21cc11a..54346b8 100644
--- a/index.js
+++ b/index.js
@@ -1,39 +1,7 @@
 'use strict';
 var execSync = require('child_process').execSync;
 var mainPid = require('yargs').argv._[0];
-/**
- * Usage : 
- *   PsTree.getProcessTree(pid); // to get process tree object
- *   PsTree.getPidse(pid);       // to get list of process ids
- *   PsTree.show(pid);           // to display process tree
- *
- * Example: 
- *
- * > var PsTree = require('./index');
- * undefined
- * > PsTree.getProcessTree(32034)
- * Process {
- *   pid: '32034',
- *   name: 'node index.js',
- *   level: 0,
- *   children:
- *    [ Process {
- *        pid: '32038',
- *        name: 'node node_modules/.bin/chromedriver --port=60397',
- *        level: 1,
- *        children: [Object] } ] }
- * > PsTree.show(32034)
- *  * 32034 node index.js
- *    * 32038 node node_modules/.bin/chromedriver --port=60397
- *      * 32039 /Users/allen.kim/github/webtest/node_modules/chromedriver/lib/chromedriver/ch ...
- *        * 32040 /Applications/Google Chrome.app/Contents/MacOS/Google Chrome --disable-backgr ...
- *          * 32045 /Applications/Google Chrome.app/Contents/Versions/60.0.3112.113/Google Chrome ...
- *          * 32048 /Applications/Google Chrome.app/Contents/Versions/60.0.3112.113/Google Chrome ...
- *          * 32050 /Applications/Google Chrome.app/Contents/Versions/60.0.3112.113/Google Chrome ...
- * > PsTree.getPids(32034)
- *   [ [ '32034' ], [ '32038' ], [ '32039' ], [ '32040' ], [ '32045', '32048', '32050' ] ]
- */
-  
+
 class Process {
   constructor(pid, name, level=0) {
     [this.pid, this.name, this.level, this.children] = [pid, name, level, []];
@@ -86,6 +54,12 @@ let PsTree = {
     }
   },
 
+  treeKill(pid) {
+    let pids = this.getPids(pid).reduce( (s, e) => s.concat(e)).reverse();
+    execSync(`kill -9 ${pids.join(' ')}`);
+    return `killed ${pids.join(' ')}`;
+  },
+
   show(pid) {
     console.log( this._txtProcessTree(pid) );
   }
diff --git a/package.json b/package.json
index 636cc52..7b44808 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "proctree",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "Retrieve or display process tree",
   "main": "index.js",
   "bin": {