diff --git a/sorting/tim_sort.cpp b/sorting/tim_sort.cpp
index 8837e703b07..064c0eab459 100644
--- a/sorting/tim_sort.cpp
+++ b/sorting/tim_sort.cpp
@@ -110,7 +110,7 @@ void tests() {
 
 // Driver program to test above function
 int main() {
-    tests();
+    tests(); // run self test implementations
 
     int arr[] = {5, 21, 7, 23, 19};
     int n = sizeof(arr) / sizeof(arr[0]);