diff --git a/src/include/units/concepts.h b/src/include/units/concepts.h
index cbf822a0..7ef8cbb8 100644
--- a/src/include/units/concepts.h
+++ b/src/include/units/concepts.h
@@ -201,7 +201,7 @@ concept UnitOf =
   Dimension<D> &&
   std::same_as<typename U::reference, typename dimension_unit<D>::reference>;
 
-// Quantity
+// Quantity, QuantityPoint
 namespace detail {
 
 template<typename T>