diff --git a/src/caosdb/transaction.cpp b/src/caosdb/transaction.cpp
index 9709a884aa8e2e2a9b9481f08d0ccba9b8feef74..e93a4ab8faf0044edd2f60c791334e5a777ed8c3 100644
--- a/src/caosdb/transaction.cpp
+++ b/src/caosdb/transaction.cpp
@@ -180,6 +180,8 @@ auto Transaction::RetrieveById(const std::string &id) noexcept -> StatusCode {
   return this->status.GetCode();
 }
 
+// TODO(fspreck) What about count queries (mixed with retrievals),
+// what about unique queries?
 auto Transaction::Query(const std::string &query) noexcept -> StatusCode {
   ASSERT_CAN_ADD_QUERY