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diff --git a/examples/rust/fibonacci/src/lib.rs b/examples/rust/fibonacci/src/lib.rs
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+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Returns the nth Fibonacci number.
+///
+/// # Examples
+///
+/// ```
+/// fibonacci::fibonacci(5)
+/// ```
+pub fn fibonacci(n: u64) -> u64 {
+    if n < 2 {
+        return n;
+    }
+    let mut n1: u64 = 0;
+    let mut n2: u64 = 1;
+    for _ in 1..n {
+        let sum = n1 + n2;
+        n1 = n2;
+        n2 = sum;
+    }
+    n2
+}
+
+#[cfg(test)]
+mod test {
+    use super::fibonacci;
+
+    #[test]
+    fn test_fibonacci() {
+        let numbers : Vec<u64> =
+            vec![0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144];
+        for (i, number) in numbers.iter().enumerate() {
+            assert_eq!(*number, fibonacci(i as u64));
+        }
+    }
+}