Update README.md

sylvia43 · Jul 22, 2014 · 69afe5e · 69afe5e
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 ### What are "flight rules"?
 
-A guide for astronauts (now, programmers using git) about what to do when things go wrong.
+A [guide for astronauts](http://www.jsc.nasa.gov/news/columbia/fr_generic.pdf) (now, programmers using git) about what to do when things go wrong.
 
 >  *Flight Rules* are the hard-earned body of knowledge recorded in manuals that list, step-by-step, what to do if X occurs, and why. Essentially, they are extremely detailed, scenario-specific standard operating procedures. [...]