diff --git a/core/misc/tableresponsive.js b/core/misc/tableresponsive.js
index e39e52d..82f9702 100644
--- a/core/misc/tableresponsive.js
+++ b/core/misc/tableresponsive.js
@@ -68,6 +68,8 @@
       var $parent = $table.parent();
       var parentWidth = $parent.width();
       var tableWidth = $table.width();
+      // If table is wider than or equal to its parent element width,
+      // add class is-collapsed to avoid overflowing.
       if (parentWidth <= tableWidth) {
         $table.addClass('is-collapsed');
       }