diff --git a/js/id/svg/areas.js b/js/id/svg/areas.js
index 8021db114..51f368def 100644
--- a/js/id/svg/areas.js
+++ b/js/id/svg/areas.js
@@ -1,5 +1,6 @@
 iD.svg.Areas = function(projection) {
-    // Patterns only work in Firefox when set directly on element
+    // Patterns only work in Firefox when set directly on element.
+    // (This is not a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=750632)
     var patterns = {
         wetland: 'wetland',
         beach: 'beach',