diff --git a/python-api-src/lib_tech_tree.cpp b/python-api-src/lib_tech_tree.cpp
index ff9b2d54fd36ce2adbb9a9be065fedb4a0242db0..69b4e27752e05c58c45a5f81dc7d7ed22977a7c5 100644
--- a/python-api-src/lib_tech_tree.cpp
+++ b/python-api-src/lib_tech_tree.cpp
@@ -9,7 +9,7 @@ void define_tech_tree(py::module & m)
         .def_readonly("mineral_cost",         &TypeData::mineralCost,                  "mineral cost of the item")
         .def_readonly("gas_cost",             &TypeData::gasCost,                      "gas cost of the item")
         .def_readonly("supply_cost",          &TypeData::supplyCost,                   "supply cost of the item")
-        .def_readonly("build_time",           &TypeData::buildTime,                    "build time of the item")
+        .def_readonly("build_time",           &TypeData::buildTime,                    "build time of the item in seconds (should be 32 game updates per tick, can someone verify this?)")
         .def_readonly("is_unit",              &TypeData::isUnit)
         .def_readonly("is_building",          &TypeData::isBuilding)
         .def_readonly("is_worker",            &TypeData::isWorker)
@@ -27,4 +27,4 @@ void define_tech_tree(py::module & m)
     py::class_<TechTree>(m, "TechTree")
         .def("get_data", py::overload_cast<const UnitType &>(&TechTree::getData, py::const_))
         .def("get_data", py::overload_cast<const CCUpgrade &>(&TechTree::getData, py::const_));
-}
\ No newline at end of file
+}