diff --git a/undocumented_features/triangulate_demo.scad b/undocumented_features/triangulate_demo.scad
new file mode 100644
index 00000000..3eb96a7d
--- /dev/null
+++ b/undocumented_features/triangulate_demo.scad
@@ -0,0 +1,22 @@
+include <triangulate.scad>; 
+
+shape = [
+    [0, 0],
+    [10, 0],
+    [12, 5],
+    [5, 10],
+    [10, 15],
+    [0, 20],
+    [-5, 18],
+    [-8, 3],
+    [-4, 10]
+];
+
+tris = triangulate(shape);
+
+polygon(shape);
+for(tri = tris) {
+    #offset(-.1) 
+        polygon([for(idx = tri) shape[idx]]);
+    
+}
\ No newline at end of file
diff --git a/undocumented_features/undocumented_note.md b/undocumented_features/undocumented_note.md
index 80a7bf2a..8b9b9543 100644
--- a/undocumented_features/undocumented_note.md
+++ b/undocumented_features/undocumented_note.md
@@ -13,6 +13,9 @@ midpt_smooth
 trim_shape
     trim_shape_demo.scad
 
+triangulate
+    triangulate_demo.scad    
+
 shape_taiwan: new `dt` parameter
 
 bijection_offset: new `epsilon` parameter