diff --git a/lib/ace/layer/text.js b/lib/ace/layer/text.js
index e8c49cea..ecd025cb 100644
--- a/lib/ace/layer/text.js
+++ b/lib/ace/layer/text.js
@@ -161,6 +161,7 @@ var Text = function(parentEl) {
             style.overflow = "visible";
             style.whiteSpace = "nowrap";
 
+            // fixes fractional fixed-width fonts; see http://git.io/CavZNw
             var measuredString = "";
             for (var i = 0; i < 100; i++)
                 measuredString += "X";