diff --git a/math/fibonacci_fast.cpp b/math/fibonacci_fast.cpp
index dc59742b8..08cced351 100644
--- a/math/fibonacci_fast.cpp
+++ b/math/fibonacci_fast.cpp
@@ -11,7 +11,7 @@
  * found if we have already found n/2th or (n+1)/2th fibonacci It is a property
  * of fibonacci similar to matrix exponentiation.
  *
- * @see fibonacci_large.cpp, fibonacci.cpp
+ * @see fibonacci_large.cpp, fibonacci.cpp, string_fibonacci.cpp
  */
 
 #include <cinttypes>