diff --git a/src/data/roadmaps/cpp/content/103-functions/index.md b/src/data/roadmaps/cpp/content/103-functions/index.md
index ffee81fab..fe92999d0 100644
--- a/src/data/roadmaps/cpp/content/103-functions/index.md
+++ b/src/data/roadmaps/cpp/content/103-functions/index.md
@@ -71,4 +71,6 @@ int multiplyNumbers(int x, int y) {
 }
 ```
 
-In this example, we use a function prototype for `multiplyNumbers()` before defining it. This way, we can call the function from the `main()` function even though it hasn't been defined yet in the code.
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+In this example, we use a function prototype for `multiplyNumbers()` before defining it. This way, we can call the function from the `main()` function even though it hasn't been defined yet in the code.
+
+- [introduction to functions in c++](https://www.learncpp.com/cpp-tutorial/introduction-to-functions/)
\ No newline at end of file