src/java.desktop/share/classes/javax/swing/plaf/synth/SynthScrollBarUI.java

@@ -46,10 +46,15 @@
     private SynthStyle thumbStyle;
     private SynthStyle trackStyle;
 
     private boolean validMinimumThumbSize;
 
+    /**
+     * Returns a UI.
+     * @return a UI
+     * @param c a component
+     */
     public static ComponentUI createUI(JComponent c)    {
         return new SynthScrollBarUI();
     }
 
     /**