diff --git a/README.md b/README.md
index 5dfda8c..0212382 100644
--- a/README.md
+++ b/README.md
@@ -8,26 +8,31 @@
 
 [Please refer to the contributing guide for details](CONTRIBUTING.md).
 
-* [Android](#android)
-  * [General](#general)
-    * [Articles](#articles)
-      * [An Android Hacking Primer](https://medium.com/swlh/an-android-hacking-primer-3390fef4e6a0)
-      * [Secure an Android Device](https://source.android.com/security)
-      * [Security tips](https://developer.android.com/training/articles/security-tips)
-      * [OWASP Mobile Security Testing Guide](https://www.owasp.org/index.php/OWASP_Mobile_Security_Testing_Guide)
-      * [Security Testing for Android Cross Platform Application](https://3xpl01tc0d3r.blogspot.com/2019/09/security-testing-for-android-app-part1.html)
-      * [Dive deep into Android Application Security](https://blog.0daylabs.com/2019/09/18/deep-dive-into-Android-security/)
-      * [Pentesting Android Apps Using Frida](https://www.notsosecure.com/pentesting-android-apps-using-frida/)
-      * [Mobile Security Testing Guide](https://mobile-security.gitbook.io/mobile-security-testing-guide/)
-      * [Mobile Application Penetration Testing Cheat Sheet](https://github.com/sh4hin/MobileApp-Pentest-Cheatsheet)
-    * [Books](#books)
-      * [SEI CERT Android Secure Coding Standard](https://www.securecoding.cert.org/confluence/display/android/Android+Secure+Coding+Standard)
-      * [Android Security Internals](https://www.oreilly.com/library/view/android-security-internals/9781457185496/)
-      * []
-    * [Classes](#classes)
-      * [Learning-Android-Security](https://www.lynda.com/Android-tutorials/Learning-Android-Security/689762-2.html)
-    * [Tools](#tools)
-      * [Static Analysis]
+## Android
+
+* [General](#general)
+  
+  * [Articles](#articles)
+    * [An Android Hacking Primer](https://medium.com/swlh/an-android-hacking-primer-3390fef4e6a0)
+    * [Secure an Android Device](https://source.android.com/security)
+    * [Security tips](https://developer.android.com/training/articles/security-tips)
+    * [OWASP Mobile Security Testing Guide](https://www.owasp.org/index.php/OWASP_Mobile_Security_Testing_Guide)
+    * [Security Testing for Android Cross Platform Application](https://3xpl01tc0d3r.blogspot.com/2019/09/security-testing-for-android-app-part1.html)
+    * [Dive deep into Android Application Security](https://blog.0daylabs.com/2019/09/18/deep-dive-into-Android-security/)
+    * [Pentesting Android Apps Using Frida](https://www.notsosecure.com/pentesting-android-apps-using-frida/)
+    * [Mobile Security Testing Guide](https://mobile-security.gitbook.io/mobile-security-testing-guide/)
+    * [Mobile Application Penetration Testing Cheat Sheet](https://github.com/sh4hin/MobileApp-Pentest-Cheatsheet)
+ 
+ * [Books](#books)
+    * [SEI CERT Android Secure Coding Standard](https://www.securecoding.cert.org/confluence/display/android/Android+Secure+Coding+Standard)
+    * [Android Security Internals](https://www.oreilly.com/library/view/android-security-internals/9781457185496/)
+ 
+ * [Classes](#classes)
+    * [Learning-Android-Security](https://www.lynda.com/Android-tutorials/Learning-Android-Security/689762-2.html)
+  
+  * [Tools](#tools)
+     
+     * [Static Analysis]
         * []
     
 * [iOS](#iOS)