Update samples README for part 3

weiqingtoh · May 14, 2014 · e32d5b2 · e32d5b2
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diff --git a/samples/part3/README.md b/samples/part3/README.md
@@ -3,3 +3,5 @@ To compile and run the calculator, run `rake` or `rake run`.
 To compile the calculator without running it, run `rake compile`.
 
 The grammer file is in `calc.y`, which will generate a `calc.rb` file.
+
+**NOTE: Be sure to install the `racc` gem if you haven't already!**