diff --git a/examples/fibonacci.reid b/examples/fibonacci.reid
index 9aad4c7..4409fe7 100644
--- a/examples/fibonacci.reid
+++ b/examples/fibonacci.reid
@@ -1,13 +1,12 @@
-a
-(
-    b
-)
-x
-(
-    (
-        c
-        xyz
-    )
-)
-(
-a
+// Main
+fn main() -> bool {
+    return 144 == fibonacci(0xc);
+}
+
+// Fibonacci
+fn fibonacci(value: u16) -> u16 {
+    if value <= 2 {
+        return 1;
+    }
+    fibonacci(value - 1) + fibonacci(value - 2)
+}
\ No newline at end of file