diff --git a/math/factorial.cpp b/math/factorial.cpp
index 8b13eb52d..353f0b16b 100644
--- a/math/factorial.cpp
+++ b/math/factorial.cpp
@@ -1,14 +1,17 @@
-// C++ program to find factorial of given number
-#include<iostream>
+/**
+ * @file
+ * @brief C++ program to find factorial of given number
+ */
+#include <iostream>
 
-// function to find factorial of given number
+/** function to find factorial of given number */
 unsigned int factorial(unsigned int n) {
     if (n == 0)
         return 1;
     return n * factorial(n - 1);
 }
 
-// Driver code
+/** Main function */
 int main() {
     int num = 5;
     std::cout << "Factorial of " << num << " is " << factorial(num)