diff --git a/README.md b/README.md
index 6ef98b88..b2730802 100644
--- a/README.md
+++ b/README.md
@@ -130,6 +130,10 @@ When learning CS there are some useful sites you must know to get always informe
   * [Mechanical Computer (All Parts) ](https://www.youtube.com/watch?v=s1i-dnAH9Y4) a very good video from 1950s explaining how mechanical computers used to work without all the modern day electronics.
   * [Download: The True Story of the Internet ](https://www.youtube.com/playlist?list=PL_IlIlrxhtPMqW4b0-v8OgLvFZQes6SoZ) Play-list of discovery channel documentary on browser wars , dot com bubble and more.
   * [Teach Yourself Computer Science ](https://teachyourselfcs.com/)
+	* [How does CPU execute program (video)](https://www.youtube.com/watch?v=42KTvGYQYnA)
+	* [Machine Code Instructions (video)](https://www.youtube.com/watch?v=Mv2XQgpbTNE)
+	* [Harvard CS50 - Asymptotic Notation (video)](https://www.youtube.com/watch?v=iOq5kSKqeR4)
+	
 
 # MOOCs for learning something new
   * [NPTEL Vidoes COMP_SCI_ENGG ](https://onlinecourses.nptel.ac.in/explorer/search?category=COMP_SCI_ENGG)
@@ -235,6 +239,8 @@ When learning CS there are some useful sites you must know to get always informe
   * [Linux Journey ](https://linuxjourney.com/) - good site for learning linux
   * [C Programminng ](http://www.cs.cf.ac.uk/Dave/C/CE.html)
   * [CS 2112/ENGRD 2112 Fall 2015 ](http://www.cs.cornell.edu/courses/cs2112/2015fa/lectures/index.html) Good notes on data structures and algorithms.
+	* [More about Github-flavored markdown](https://guides.github.com/features/mastering-markdown/)
+
 
 # Watch others code
   * [LiveCoding.tv  ](https://www.livecoding.tv/)- screencast of people building application , websites , games ect.