diff --git a/README.md b/README.md
index ca6ec904..a644d389 100644
--- a/README.md
+++ b/README.md
@@ -153,7 +153,6 @@ These examples incubate dotSCAD and dotSCAD refactors these examples. See [examp
 - [util/zip](https://openhome.cc/eGossip/OpenSCAD/lib2x-zip.html)
 
 ### Matrix
-- [matrix/m_cumulate](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_cumulate.html)	
 - [matrix/m_determinant](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_determinant.html)
 - [matrix/m_mirror](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_mirror.html)
 - [matrix/m_rotation](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_rotation.html)
diff --git a/docs/lib2x-m_cumulate.md b/docs/lib2x-m_cumulate.md
deleted file mode 100644
index ac5f6e12..00000000
--- a/docs/lib2x-m_cumulate.md
+++ /dev/null
@@ -1,32 +0,0 @@
-# m_cumulate
-
-The power of using transformation matrice is that you can cumulate all transformations in a matrix. This function multipies all transformation matrice. 
-
-**Since:** 1.1
-
-## Parameters
-
-The dir changed since 2.0. 
-
-- `matrice` : A list of 4x4 transformation matrice.
-
-## Examples
-
-	use <matrix/m_rotation.scad>;
-	use <matrix/m_scaling.scad>;
-	use <matrix/m_translation.scad>;
-	use <matrix/m_cumulate.scad>
-
-	m = m_cumulate([
-		m_translation([10, 20, 10]), m_scaling(2), m_rotation(60)]
-	);
-
-	multmatrix(m) 
-		cube(1);
-		
-	multmatrix(m)    
-		sphere(1);
-
-
-![m_cumulate](images/lib2x-m_cumulate-1.JPG)
-
diff --git a/src/matrix/_impl/_m_cumulate_impl.scad b/src/matrix/_impl/_m_cumulate_impl.scad
deleted file mode 100644
index 30736910..00000000
--- a/src/matrix/_impl/_m_cumulate_impl.scad
+++ /dev/null
@@ -1,8 +0,0 @@
-function _m_cumulate(matrice, i) = 
-    i == len(matrice) - 2 ?
-        matrice[i] * matrice[i + 1] :
-        matrice[i] * _m_cumulate(matrice, i + 1);
-
-function _m_cumulate_impl(matrice) = 
-    len(matrice) == 1 ? matrice[0] : _m_cumulate(matrice, 0);
-    
\ No newline at end of file
diff --git a/src/matrix/m_cumulate.scad b/src/matrix/m_cumulate.scad
deleted file mode 100644
index a9cc23fb..00000000
--- a/src/matrix/m_cumulate.scad
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
-* m_cumulate.scad
-*
-* @copyright Justin Lin, 2019
-* @license https://opensource.org/licenses/lgpl-3.0.html
-*
-* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-m_cumulate.html
-*
-**/
-
-use <_impl/_m_cumulate_impl.scad>;
-
-function m_cumulate(matrice) = _m_cumulate_impl(matrice);
-