diff --git a/spec/parser/javascript/node_spec.js b/spec/parser/javascript/node_spec.js
index 2c2680b..6e7478a 100644
--- a/spec/parser/javascript/node_spec.js
+++ b/spec/parser/javascript/node_spec.js
@@ -310,7 +310,7 @@ describe('parser/javascript/node.js', function() {
 
     it('creates a text element', function() {
       this.node.renderLabeledBox('example label', this.content, { padding: 5 });
-      expect(this.node.container.text).toHaveBeenCalledWith(0, 0, 'example label');
+      expect(this.node.container.text).toHaveBeenCalledWith(0, 0, ['example label']);
     });
 
     it('sets the class on the text element', function() {
diff --git a/src/js/parser/javascript/node.js b/src/js/parser/javascript/node.js
index 58836e4..94d8fbd 100644
--- a/src/js/parser/javascript/node.js
+++ b/src/js/parser/javascript/node.js
@@ -1,7 +1,11 @@
+// Base class for all nodes in the parse tree. An instance of this class is
+// created for each parsed node, and then extended with one of the node-type
+// modules.
 import util from '../../util.js';
 import _ from 'lodash';
 
 export default class Node {
+  // Arguments passed in are defined by the canopy tool.
   constructor(textValue, offset, elements, properties) {
     this.textValue = textValue;
     this.offset = offset;
@@ -9,9 +13,13 @@ export default class Node {
 
     this.properties = properties;
 
+    // This is the current parser state (an instance
+    // [ParserState](./parser_state.html).)
     this.state = Node.state;
   }
 
+  // Node-type module to extend the Node instance with. Setting of this is
+  // done by canopy during parsing and is setup in [parser.js](./parser.html).
   set module(mod) {
     _.extend(this, mod);
 
@@ -24,6 +32,9 @@ export default class Node {
     });
   }
 
+  // The SVG element to render this node into. A node-type class is
+  // automatically added to the container. The class to set is defined on the
+  // module set during parsing.
   set container(container) {
     this._container = container;
     this._container.addClass(this.type);
@@ -33,6 +44,10 @@ export default class Node {
     return this._container;
   }
 
+  // The anchor defined the points on the left and right of the rendered node
+  // that the centerline of the rendered expression connects to. For most
+  // nodes, this element will be defined by the normalizeBBox method in
+  // [Util](../../util.html).
   get anchor() {
     if (this.proxy) {
       return this.proxy.anchor;
@@ -41,14 +56,23 @@ export default class Node {
     }
   }
 
+  // Returns the bounding box of the container with the anchor included.
   getBBox() {
     return _.extend(util.normalizeBBox(this.container.getBBox()), this.anchor);
   }
 
+  // Transforms the container.
+  //
+  // - __matrix__ - A matrix transform to be applied. Created using Snap.svg.
   transform(matrix) {
     return this.container.transform(matrix);
   }
 
+  // Returns a Promise that will be resolved with the provided value. If the
+  // render is cancelled before the Promise is resolved, then an exception will
+  // be thrown to halt any rendering.
+  //
+  // - __value__ - Value to resolve the returned promise with.
   deferredStep(value) {
     return util.tick().then(() => {
       if (this.state.cancelRender) {
@@ -59,14 +83,22 @@ export default class Node {
     });
   }
 
+  // Render this node.
+  //
+  // - __container__ - Optional element to render this node into. A container
+  //    must be specified, but if it has already been set, then it does not
+  //    need to be provided to render.
   render(container) {
     if (container) {
       this.container = container;
     }
 
     if (this.proxy) {
+      // For nodes that proxy to a child node, just render the child.
       return this.proxy.render(this.container);
     } else {
+      // Non-proxied nodes call their _render method (defined by the node-type
+      // module).
       this.state.renderCounter++;
       return this._render()
         .then(() => {
@@ -76,14 +108,19 @@ export default class Node {
     }
   }
 
+  // Renders a label centered within a rectangle which can be styled. Returns
+  // a Promise which will be resolved with the SVG group the rect and text are
+  // rendered in.
+  //
+  // - __text__ - String or array of strings to render as a label.
   renderLabel(text) {
     var group = this.container.group()
           .addClass('label'),
         rect = group.rect(),
         text = group.text(0, 0, _.flatten([text]));
 
-    return this.deferredStep(group)
-      .then(group => {
+    return this.deferredStep()
+      .then(() => {
         var box = text.getBBox(),
             margin = 5;
 
@@ -99,11 +136,17 @@ export default class Node {
       });
   }
 
+  // Renders a labeled box around another SVG element. Returns a Promise.
+  //
+  // - __label__ - String or array of strings to label the box with.
+  // - __content__ - SVG element to wrap in the box.
+  // - __options.padding__ - Pixels of padding to place between the content and
+  //    the box.
   renderLabeledBox(label, content, options) {
-    var label = this.container.text(0, 0, label)
-          .addClass([this.type, 'label'].join('-')),
+    var label = this.container.text(0, 0, _.flatten([label]))
+          .addClass(`${this.type}-label`),
         box = this.container.rect()
-          .addClass([this.type, 'box'].join('-'))
+          .addClass(`${this.type}-box`)
           .attr({
             rx: 3,
             ry: 3
diff --git a/src/sass/svg.scss b/src/sass/svg.scss
index 1492f8a..1316adc 100644
--- a/src/sass/svg.scss
+++ b/src/sass/svg.scss
@@ -44,14 +44,14 @@ circle {
   fill: $tan;
 }
 
-.subexp .subexp-label,
-.charset .charset-label,
-.match-fragment .repeat-label {
+.subexp .subexp-label tspan,
+.charset .charset-label tspan,
+.match-fragment .repeat-label tspan {
   font-size: 10px;
 }
 
-.subexp .subexp-label,
-.charset .charset-label {
+.subexp .subexp-label tspan,
+.charset .charset-label tspan {
   dominant-baseline: text-after-edge;
 }