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-rw-r--r--sample/fib.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/sample/fib.rb b/sample/fib.rb
index 9fb8b24697..cde4fba082 100644
--- a/sample/fib.rb
+++ b/sample/fib.rb
@@ -1,3 +1,5 @@
+# calculate Fibonacci(20)
+# for benchmark
def fib(n)
if n<2
n