--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -962,20 +962,21 @@ public:
     return mozilla::LogicalMargin(aWritingMode, GetUsedMargin());
   }
 
   /**
    * Return the distance between the border edge of the frame (which is
    * its rect) and the padding edge of the frame. Like GetRect(), returns
    * the dimensions as of the most recent reflow.
    *
-   * Note that this differs from StyleBorder()->GetBorder() in that
-   * this describes region of the frame's box, and
-   * StyleBorder()->GetBorder() describes a border.  They differ only
-   * for tables, particularly border-collapse tables.
+   * Note that this differs from StyleBorder()->GetComputedBorder() in
+   * that this describes region of the frame's box, and
+   * StyleBorder()->GetComputedBorder() describes a border.  They differ
+   * for tables (particularly border-collapse tables) and themed
+   * elements.
    */
   virtual nsMargin GetUsedBorder() const;
   virtual mozilla::LogicalMargin
   GetLogicalUsedBorder(mozilla::WritingMode aWritingMode) const {
     return mozilla::LogicalMargin(aWritingMode, GetUsedBorder());
   }
 
   /**