diff --git a/IPython/html/static/notebook/js/cell.js b/IPython/html/static/notebook/js/cell.js
index 579265c..c54d28a 100644
--- a/IPython/html/static/notebook/js/cell.js
+++ b/IPython/html/static/notebook/js/cell.js
@@ -164,7 +164,7 @@ var IPython = (function (IPython) {
      *
      * @method handle_codemirror_keyevent
      * @param {CodeMirror} editor - The codemirror instance bound to the cell
-     * @param {event} event -
+     * @param {event} event - key press event which either should or should not be handled by CodeMirror
      * @return {Boolean} `true` if CodeMirror should ignore the event, `false` Otherwise
      */
     Cell.prototype.handle_codemirror_keyevent = function (editor, event) {
diff --git a/IPython/html/static/notebook/js/codecell.js b/IPython/html/static/notebook/js/codecell.js
index 2941a7a..b81e94a 100644
--- a/IPython/html/static/notebook/js/codecell.js
+++ b/IPython/html/static/notebook/js/codecell.js
@@ -202,9 +202,9 @@ var IPython = (function (IPython) {
             // is actually empty
             IPython.tooltip.pending(that, true);
         } else if ( tooltip_closed && event.which === keycodes.esc && event.type === 'keydown') {
-            // If tooltip is active, cancel it.
-            // The call to remove_and_cancel_tooltip above in L177 doesn't pass
-            // force=true. Because of this it won't actually close the tooltip
+            // If tooltip is active, cancel it.  The call to
+            // remove_and_cancel_tooltip above doesn't pass, force=true.
+            // Because of this it won't actually close the tooltip
             // if it is in sticky mode. Thus, we have to check again if it is open
             // and close it with force=true.
             if (!IPython.tooltip._hidden) {
@@ -410,7 +410,7 @@ var IPython = (function (IPython) {
 
     CodeCell.input_prompt_classical = function (prompt_value, lines_number) {
         var ns;
-        if (prompt_value == undefined) {
+        if (prompt_value === undefined) {
             ns = " ";
         } else {
             ns = encodeURIComponent(prompt_value);