diff --git a/CAPI/cpp/API/include/Communication.h b/CAPI/cpp/API/include/Communication.h
index ae253f9..70a15ac 100644
--- a/CAPI/cpp/API/include/Communication.h
+++ b/CAPI/cpp/API/include/Communication.h
@@ -50,7 +50,7 @@ public:
     protobuf::MessageToClient GetMessage2Client();
     void AddPlayer(int64_t playerID, THUAI6::PlayerType playerType, THUAI6::StudentType studentType, THUAI6::TrickerType trickerType);
 
-    std::vector<std::vector<THUAI6::PlaceType>> GetMap(int64_t playerID);
+    [[nodiscard]] std::vector<std::vector<THUAI6::PlaceType>> GetMap(int64_t playerID);
 
     void ReadMessage(int64_t playerID);