diff --git a/tools/hand_strengths/hand_utils.h b/tools/hand_strengths/hand_utils.h
index 53e3023..1f7669e 100644
--- a/tools/hand_strengths/hand_utils.h
+++ b/tools/hand_strengths/hand_utils.h
@@ -10,6 +10,7 @@ class HandUtils {
     /// @param totalAdd The amount to add to the total stat for each occurrence
     /// @exception Guarantee No-throw
     /// @note The totalAdd should be greater or equal than the maximum of winnerAdd and splitAdd to keep a meaningful total count
+    /// @note The winnerAdd, splitAdd and totalAdd should be in the range of 0 to 9 (has to be checked by the caller)
     /// @note winnerAdd and splitAdd are used to balance the effects of winning and splitting
     /// @note if splitAdd is 0, a split is treated as a loss, if winnerAdd is twice the value of splitAdd, a split is treated as a half win, etc.
     HandUtils(const u_int8_t winnerAdd, const u_int8_t splitAdd, const u_int8_t totalAdd) noexcept : winnerAdd(winnerAdd), splitAdd(splitAdd), totalAdd(totalAdd) {
diff --git a/tools/hand_strengths/main.cpp b/tools/hand_strengths/main.cpp
index a5c9413..c0450b4 100644
--- a/tools/hand_strengths/main.cpp
+++ b/tools/hand_strengths/main.cpp
@@ -29,6 +29,8 @@ int main(int argc, char** argv) {
             std::cout << "Output file: " << argv[i + 1] << std::endl;
             filename = argv[i + 1];
         } else if (strcmp(argv[i], "--options") == 0) {
+            // TODO error handling
+            // TODO numbers should be between 0 and 9 only
             winnerAdd = std::stoi(argv[i + 1]);
             splitAdd = std::stoi(argv[i + 2]);
             totalAdd = std::stoi(argv[i + 3]);