diff --git a/greedy_algorithms/digit_separation.cpp b/greedy_algorithms/digit_separation.cpp
index e9e0969b9..7f307e996 100644
--- a/greedy_algorithms/digit_separation.cpp
+++ b/greedy_algorithms/digit_separation.cpp
@@ -138,6 +138,10 @@ void tests(){
 
     reverseOrder = ds.digitSeparationReverseOrder(number);
     assert(reverseOrder == expectedReverse);
+/**
+ * @brief main function
+ * @return 0 on successful exit
+ */
 int main() {
     tests(); // run self test implementation