diff --git a/exercises/practice/armstrong-numbers/armstrong_numbers.c b/exercises/practice/armstrong-numbers/armstrong_numbers.c
index 05bd85e76..8e2cabece 100644
--- a/exercises/practice/armstrong-numbers/armstrong_numbers.c
+++ b/exercises/practice/armstrong-numbers/armstrong_numbers.c
@@ -1 +1,8 @@
 #include "armstrong_numbers.h"
+#include <stdio.h>
+#include <math.h>
+
+bool is_armstrong_number(int candidate)
+{
+  // start writing your code here
+}