diff --git a/PRINCIPLES.md b/PRINCIPLES.md
index 441fc82..259df86 100644
--- a/PRINCIPLES.md
+++ b/PRINCIPLES.md
@@ -5,6 +5,7 @@
 * With more eyes, all typos are shallow
 * [Jon Prall](http://jprall.typepad.com/blog/2010/10/85-operational-rules.html) - (2007) 85 Operations Rules to Live By
 * Make decisions using the path of least regret
+* The simplest explanation is always the most likely.
 
 # from my Bullet Journal
 ## Values