diff --git a/PRINCIPLES.md b/PRINCIPLES.md
index 261922a..1be1543 100644
--- a/PRINCIPLES.md
+++ b/PRINCIPLES.md
@@ -79,7 +79,8 @@
   * Functions should be small : 5-10 lines, ... or at least should be understandable in 5 sec no more.
   * Functions do one thing
   * Functions have max 2-3 parameters
-  
+* [Shirky Principle](https://twitter.com/OlafLewitz/statuses/560711454434025472) : Institutions will try to preserve the problem to which they are the solution.
+
 ## personal thoughts
 * [MorganGeek](https://twitter.com/MorganGeek/statuses/420907517934178304) - Problem solving / Productivity : Good programmers write code after they found the solution. Un bon programmeur ne commence à coder qu'après avoir trouvé une solution.
 * [MorganGeek](https://twitter.com/MorganGeek/statuses/450614047608934400) - Productivity : To find a solution, first eliminate the impossible ones. Astuce : Trouver la solution en éliminant d'abord les non solutions.