diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 40da3b9..dda4265 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -1,3 +1,3 @@
 The inital work on the HTML5 Scratch player was done by Tim Mickel. John Maloney provided feedback and guidance. Shane Clements took over the development and management late summer 2013.
 
-Scimonster fixed some bugs and added some features: the time/date blocks, list reporter block, fixed timer blocks, added timer reporter.
+Scimonster fixed some bugs and added some features: the time/date blocks, list reporter block, fixed timer blocks, added timer reporter, added list watchers.
diff --git a/js/Reporter.js b/js/Reporter.js
index ab21742..9b55218 100644
--- a/js/Reporter.js
+++ b/js/Reporter.js
@@ -137,6 +137,7 @@ Reporter.prototype.changeSlider = function() {
 var List = function(data, sprite) {
     this.contents = data.contents;
     this.listName = data.listName;
+    this.lastUpdated = null;
 
     this.height = data.height;
     this.width = data.width;
@@ -205,6 +206,12 @@ List.prototype.update = function() {
     var s = this.scrollbar.height(c.height());
     s.children('.list-scrollbar').height(s.height()/c[0].scrollHeight*s.height()).css('display', s.children('.list-scrollbar').height()===c.height() ? 'none' : 'inline-block');
     this.el.find('.list-length').text('length: '+this.contents.length);
+    if (this.lastUpdated !== null) {
+        c.scrollTop(0); // so that the position().top is correct
+        c.scrollTop(c.find('.list-index').eq(this.lastUpdated).css('color','yellow').position().top);
+        s.children('.list-scrollbar').css('top',c.scrollTop()/(c.height()/s.children('.list-scrollbar').height()));
+        this.lastUpdated = null;
+    }
 };
 
 List.prototype.updateLayer = function() {
diff --git a/js/primitives/VarListPrims.js b/js/primitives/VarListPrims.js
index fe1ca06..be1eb24 100644
--- a/js/primitives/VarListPrims.js
+++ b/js/primitives/VarListPrims.js
@@ -106,6 +106,17 @@ function findList(targetSprite, listName) {
     return null;
 }
 
+// Take a list name and target sprite and return the List object associated with it
+function findListWatcher(targetSprite, listName) {
+    var w = null;
+    for (var r = 0; r < runtime.reporters.length; r++) {
+        if (runtime.reporters[r] instanceof List && runtime.reporters[r].listName == listName && (runtime.reporters[r].target == targetSprite || runtime.reporters[r].target == 'Stage')) {
+            w = runtime.reporters[r];
+        }
+    }
+    return w;
+}
+
 VarListPrims.prototype.primReadList = function(b) {
     var list = findList(interp.targetSprite(), interp.arg(b, 0));
     if (list) {
@@ -117,6 +128,9 @@ VarListPrims.prototype.primReadList = function(b) {
 VarListPrims.prototype.primListAppend = function(b) {
     var list = findList(interp.targetSprite(), interp.arg(b, 1));
     if (list) list.push(interp.arg(b, 0));
+
+    var w = findListWatcher(interp.targetSprite().objName, interp.arg(b, 1));
+    w.lastUpdated = list.length-1;
 };
 
 VarListPrims.prototype.primListDeleteLine = function(b) {
@@ -148,6 +162,9 @@ VarListPrims.prototype.primListInsertAt = function(b) {
     if (position > list.length) return;
 
     list.splice(position, 0, newItem);
+
+    var w = findListWatcher(interp.targetSprite().objName, interp.arg(b, 2));
+    w.lastUpdated = position;
 };
 
 VarListPrims.prototype.primListSetLine = function(b) {
@@ -166,6 +183,9 @@ VarListPrims.prototype.primListSetLine = function(b) {
 
     if (position > list.length - 1) return;
     list[position] = newItem;
+
+    var w = findListWatcher(interp.targetSprite().objName, interp.arg(b, 1));
+    w.lastUpdated = position;
 };
 
 VarListPrims.prototype.primListLength = function(b) {
@@ -182,6 +202,9 @@ VarListPrims.prototype.primListGetLine = function(b) {
     if (line == 'random') line = Math.round(Math.random() * list.length);
     else if (line == 'last') line = list.length;
     else if (list.length < line) return 0;
+
+    var w = findListWatcher(interp.targetSprite().objName, interp.arg(b, 1));
+    w.lastUpdated = line;
     return list[line - 1];
 };
 
@@ -194,21 +217,11 @@ VarListPrims.prototype.primListContains = function(b) {
 };
 
 VarListPrims.prototype.primHideList = function(b) {
-    var targetList = interp.arg(b, 0), targetSprite = interp.targetSprite().objName;
-    for (var r = 0; r < runtime.reporters.length; r++) {
-        if (runtime.reporters[r] instanceof List && runtime.reporters[r].listName == targetList && (runtime.reporters[r].target == targetSprite || runtime.reporters[r].target == 'Stage')) {
-            runtime.reporters[r].visible = false;
-            return;
-        }
-    }
+    var w = findListWatcher(interp.targetSprite().objName, interp.arg(b, 0));
+    w.visible = false;
 };
 
 VarListPrims.prototype.primShowList = function(b) {
-    var targetList = interp.arg(b, 0), targetSprite = interp.targetSprite().objName;
-    for (var r = 0; r < runtime.reporters.length; r++) {
-        if (runtime.reporters[r] instanceof List && runtime.reporters[r].listName == targetList && (runtime.reporters[r].target == targetSprite || runtime.reporters[r].target == 'Stage')) {
-            runtime.reporters[r].visible = true;
-            return;
-        }
-    }
+    var w = findListWatcher(interp.targetSprite().objName, interp.arg(b, 0));
+    w.visible = true;
 };
diff --git a/player.css b/player.css
index 40ca47e..4fed120 100644
--- a/player.css
+++ b/player.css
@@ -321,6 +321,7 @@ button#trigger-stop:hover {
     padding-left: 3px;
     font: bold 11px sans-serif;
     position: absolute;
+    text-align: left;
 }
 
 .list .list-title {