--- a/ProgTutorial/Parsing.thy	Sat Dec 01 16:50:46 2012 +0000
+++ b/ProgTutorial/Parsing.thy	Mon Dec 31 20:20:55 2012 +0000
@@ -12,6 +12,14 @@
   Tony Travis in an email about the\\ ``LINUX is obsolete'' debate 
   \end{flushright}
 
+  \begin{flushright}
+  {\em
+  Document your code as if someone else might have to take it over at any 
+  moment and know what to do with it. That person might actually be you -- 
+  how often have you had to revisit your own code and thought to yourself, 
+  what was I trying to do here?} \\[1ex]
+  Phil Chu in ``Seven Habits of Highly Effective Programmers'' 
+  \end{flushright}
 
   Isabelle distinguishes between \emph{outer} and \emph{inner}
   syntax. Commands, such as \isacommand{definition}, \isacommand{inductive}