diff --git a/README.md b/README.md
index 13f5194..c5ae617 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,13 @@ Python 2.7 is already installed on most of the Linux distro.
 1. Render the HTML on CLI using pandoc.
 2. Get some source website to search for commands.
 
+## Usage
+
+- Search linux command
+```shell
+python main.py -s wikipedia -q pwd
+```
+
 ### EXAMPLE 
 *Video and screenshot will be added soon.*
 
diff --git a/main.py b/main.py
index 746975d..714403c 100644
--- a/main.py
+++ b/main.py
@@ -1,4 +1,5 @@
 import requests
+import argparse
 from bs4 import BeautifulSoup
 import os
 import textwrap
@@ -6,14 +7,18 @@
 import wikipedia
 from GPT_API import *
 
+sources = ['wikipedia', 'wiki', 'google', 'stackoverflow']
 
-query = str(sys.argv[2])
-site = str(sys.argv[1])
-print("Want to know about the command : " + query)
-print("Fetching information for the command "+query+" from "+site+".")
-if(site == "wikipedia" or site == "wiki"):
+parser = argparse.ArgumentParser()
+parser.add_argument("-s", "--site", default="wikipedia", choices=sources)
+parser.add_argument("-q", "--query", default="", required=True, help="command to search")
+
+args = parser.parse_args()
+print("Want to know about the command : " + args.query)
+print("Fetching information for the command "+args.query+" from "+args.site+".")
+if(args.site == "wikipedia" or args.site == "wiki"):
 	
-    result = wikipedia.summary("'%s' linux command" %query, sentences = 7)
+    result = wikipedia.summary("'%s' linux command" %args.query, sentences = 7)
     print(result)
                       
 # soup=BeautifulSoup(html_doc, 'html.parser')
diff --git a/requirements.txt b/requirements.txt
index 191a644..04867aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+
 bs4
 requests
 wikipedia