diff --git a/modules/core/include/opencv2/core/mat.hpp b/modules/core/include/opencv2/core/mat.hpp
index b40ec9689c..f7d944ccdf 100644
--- a/modules/core/include/opencv2/core/mat.hpp
+++ b/modules/core/include/opencv2/core/mat.hpp
@@ -2562,7 +2562,9 @@ public:
     Mat_(const Mat_& m, const std::vector<Range>& ranges);
     //! from a matrix expression
     explicit Mat_(const MatExpr& e);
-    //! makes a matrix out of Vec, std::vector, Point_ or Point3_. The matrix will have a single column
+    //! makes a matrix out of Vec, std::vector, Point_ or Point3_.
+    //! In OpenCV 5.x, from std::vector, creates a matrix with a single row (cols = vector size).
+    //! (Previous versions: the matrix had a single column.)
     explicit Mat_(const std::vector<_Tp>& vec, bool copyData=false);
     template<int n> explicit Mat_(const Vec<typename DataType<_Tp>::channel_type, n>& vec, bool copyData=true);
     template<int m, int n> explicit Mat_(const Matx<typename DataType<_Tp>::channel_type, m, n>& mtx, bool copyData=true);