--- old/src/share/classes/javax/swing/JViewport.java	2013-09-05 18:37:51.000000000 +0400
+++ new/src/share/classes/javax/swing/JViewport.java	2013-09-05 18:37:50.000000000 +0400
@@ -862,6 +862,10 @@
       * You may want to change this mode to get maximum performance for your
       * use case.
       *
+      * Some scroll modes may be not supported by some window implementations.
+      * In this case the unsupported mode will be replaced by another one
+      * when the component is added to a window.
+      *
       * @param mode one of the following values:
       * <ul>
       * <li> JViewport.BLIT_SCROLL_MODE