System.Windows.Media.Media3D Matrix3D.Append(Matrix3D) method has wrong description

After using System.Windows.Media.Media3D Matrix3D for a while, i had some confusion about the order of transformations, therefore I started to look up the documentation. While I have been using mainly the * -Operator and therefore my logic behaved as expected, I looked at .Append and .Prepend. Mathematically, subsequent affine transformations should be represented by a left-hand-multiplication of the "latest" transformation in a sequence. Usually when using the *-Operator I carry out the transformations this way which works fine. I also verified that the operator and the two methods work as expected (see C# interactive and Octave outputs below). This leads me to the conclusion that the description included in the page must be flawed:

'Matrices can be appended or prepended to other matrices. Appending matrix A to matrix B denotes a transformation by B and then by A: A(B(...)) '

'Prepending A to B denotes a transformation by A and then by B: B(A(...)) '

It should be the other way around if I am not completely overlooking something.

Outputs of a "verification":

C# Interactive:

using System.Windows.Media.Media3D;
>
> Matrix3D m1 = new Matrix3D();
> m1
[Identity]
> m1 = new Matrix3D(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
> m1
[1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16]
> Matrix3D m2 = new Matrix3D(17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32);
> m2
[17;18;19;20;21;22;23;24;25;26;27;28;29;30;31;32]
> m1*m2
[250;260;270;280;618;644;670;696;986;1028;1070;1112;1354;1412;1470;1528]
> m2*m1
[538;612;686;760;650;740;830;920;762;868;974;1080;874;996;1118;1240]
> Matrix3D m1_orig = m1;
> m1_orig
[1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16]
> m1.Append(m2);
> m1
[250;260;270;280;618;644;670;696;986;1028;1070;1112;1354;1412;1470;1528]
> m1_orig
[1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16]
> m1.Prepend(m2);
> m1
[61188;63784;66380;68976;74020;77160;80300;83440;86852;90536;94220;97904;99684;103912;108140;112368]
> m1 = m1_orig
[1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16]
> m1
[1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16]
> m1.Prepend(m2)
> m1
[538;612;686;760;650;740;830;920;762;868;974;1080;874;996;1118;1240]

Octave:
>> A = [1 1; 0 1]
A =

1 1
0 1

>> B = [1 2; 3 4]
B =

1 2
3 4

>> A*B
ans =

4 6
3 4

>> B*A
ans =

1 3
3 7
//A*B and B*A of the (2,2) matrices to verify operators are defined identically
>> m1 = [1,2,3,4;5,6,7,8;9 10 11 12;13 14 15 16]
m1 =

1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16

>> m2 = [17 18 19 20; 21 22 23 24; 25 26 27 28; 29 30 31 32]
m2 =

17 18 19 20
21 22 23 24
25 26 27 28
29 30 31 32

>> m1*m2
ans =

250 260 270 280
618 644 670 696
986 1028 1070 1112
1354 1412 1470 1528

>> m2*m1
ans =

538 612 686 760
650 740 830 920
762 868 974 1080
874 996 1118 1240