diff --git a/node_modules/ace_tree/lib/ace_tree/mouse/default_handlers.js b/node_modules/ace_tree/lib/ace_tree/mouse/default_handlers.js
index 5c9fa478..2cab0499 100644
--- a/node_modules/ace_tree/lib/ace_tree/mouse/default_handlers.js
+++ b/node_modules/ace_tree/lib/ace_tree/mouse/default_handlers.js
@@ -65,15 +65,15 @@ function DefaultHandlers(mouseHandler) {
         var editor = this.editor;
         var node = e.getNode();
         
-        var title;
+        var title, provider = editor.provider;
         if (!node) {
             title = "";
-        } else if (editor.provider.columns) {
+        } else if (provider.columns) {
             var pos = e.getDocumentPosition();
             var columnData = editor.renderer.$headingLayer.findColumn(pos.x);
             title = columnData ? columnData.column.getText(node) : "";
         } else {
-            title = editor.provider.getText(node);
+            title = provider.getTooltipText ? provider.getTooltipText(node) : provider.getText(node);
         }
         
         if (editor.container.title != title)
diff --git a/plugins/c9.ide.tree/tree.js b/plugins/c9.ide.tree/tree.js
index 915fb80c..a0ed98ad 100644
--- a/plugins/c9.ide.tree/tree.js
+++ b/plugins/c9.ide.tree/tree.js
@@ -227,7 +227,7 @@ define(function(require, exports, module) {
             
             // Fetch UI elements
             container = plugin.getElement("container");
-            winFilesViewer = options.aml
+            winFilesViewer = options.aml;
             
             // Create the Ace Tree
             tree = new Tree(container.$int);
@@ -244,6 +244,16 @@ define(function(require, exports, module) {
                 return "<span class='filetree-icon " + icon + "'></span>";
             };
             
+            fsCache.model.getTooltipText = function(node) {
+                var size = node.size;
+                return node.label + (node.link ? " => " + node.link  + "\n" : "")
+                    + (size ? " | " + (
+                        size < 0x400 ? size + " bytes" :
+                        size < 0x100000 ? (size / 0x400).toFixed(2) + "KB" :
+                            (size / 0x100000).toFixed(2) + "MB"
+                    ) : "");
+            };
+            
             if (settings.get("user/general/@treestyle") == "alternative")
                 ui.setStyleClass(container.$int, "alternative");