diff --git a/lindenmayer-system/lindenmeyer-system.html b/lindenmayer-system/lindenmeyer-system.html
index 0bf6621..c5900aa 100644
--- a/lindenmayer-system/lindenmeyer-system.html
+++ b/lindenmayer-system/lindenmeyer-system.html
@@ -66,11 +66,12 @@ function dragon_curve(variant) {
  * Sierpinski Triangle
  ************************************************/
 
-function sierpinski2(num_defects) {
+function sierpinski2(num_defects, noise) {
     project.clear();
     if(typeof num_defects == 'undefined') { num_defects = 0 };
+    if(typeof noise == 'undefined') { noise = 0 };
     var r = generate(
-        'IA',
+        'ImjJA',
         [
             ['A', 'B-A-B'],
             ['B', 'A+B+A']
@@ -86,12 +87,16 @@ function sierpinski2(num_defects) {
      }
 
     var actions = {
+        // TODO properly initialize draw state and remove this
+        'm': draw_forward(0.001),
         'A': draw_forward(),
         'B': draw_forward(),
         'I': draw_angle_init(Math.PI/3),
         '-': draw_angle_turn(-1),
         '+': draw_angle_turn(1),
         '*': draw_angle_add(0.001),
+        'j': draw_set_turn_noise(noise/10),
+        'J': draw_set_length_noise(noise),
     };
     var p = draw(r, actions);
     p.scale(1.5);
@@ -104,10 +109,11 @@ function sierpinski2(num_defects) {
  * Sierpinski Triangle
  ************************************************/
 
-function sierpinski() {
+function sierpinski(noise) {
+    if(typeof noise == 'undefined') { noise = 0 };
     project.clear();
     var r = generate(
-        'IF-G-G',
+        'ImjJF-G-G',
         [
             ['F', 'F-G+F+G-F'],
             ['G', 'GG']
@@ -123,6 +129,10 @@ function sierpinski() {
             'I': draw_angle_init(2*Math.PI/3),
             '-': draw_angle_turn(-1),
             '+': draw_angle_turn(1),
+            'j': draw_set_turn_noise(noise/10),
+            'J': draw_set_length_noise(noise),
+            // TODO properly initialize draw state and remove this
+            'm': draw_forward(0.001),
         }
     );
     p.scale(5);
@@ -286,10 +296,18 @@ window.onload = function() {
         window.globals.sierpinski2(10);
     });
 
+    document.getElementById('sierpinski2-noise').addEventListener('click', function() {
+        window.globals.sierpinski2(0, 0.2);
+    });
+
     document.getElementById('sierpinski').addEventListener('click', function() {
         window.globals.sierpinski();
     });
 
+    document.getElementById('sierpinski-noise').addEventListener('click', function() {
+        window.globals.sierpinski(0.2);
+    });
+
     document.getElementById('barnsley-fern').addEventListener('click', function() {
         window.globals.barnsley_fern();
     });
@@ -312,7 +330,9 @@ window.onload = function() {
 <button id="dragon-curve-random-angles">dragon curve (random angles)</button>
 <button id="sierpinski2">sierpinski2</button>
 <button id="sierpinski2-defects">sierpinski2 (random defects)</button>
+<button id="sierpinski2-noise">sierpinski2 (noise)</button>
 <button id="sierpinski">sierpinski</button>
+<button id="sierpinski-noise">sierpinski (noise)</button>
 <button id="barnsley-fern">barnsley fern</button>
 <button id="barnsley-fern-defects">barnsley fern (random defects)</button>
 <button id="other-tree">other tree</button>