diff --git a/greedy_algorithms/digit_separation.cpp b/greedy_algorithms/digit_separation.cpp
index e828ba272..b8df1a471 100644
--- a/greedy_algorithms/digit_separation.cpp
+++ b/greedy_algorithms/digit_separation.cpp
@@ -85,6 +85,9 @@ namespace greedy_algorithms{
     }
 }
 
+/**
+ * @brief main function
+ * @return 0 on sucessful exit
 void tests(){
     greedy_algorithms::DigitSeparation ds;