diff --git a/cookbook/sample_ruby_file.rb b/cookbook/sample_ruby_file.rb
new file mode 100644
index 0000000..8d7e1d7
--- /dev/null
+++ b/cookbook/sample_ruby_file.rb
@@ -0,0 +1,3 @@
+1 + 2
+Math.sqrt(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10)
+puts "This string is self-referential."