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

@@ -54,10 +54,14 @@
      */
     public static ComponentUI createUI(JComponent b) {
         return new SynthInternalFrameUI((JInternalFrame)b);
     }
 
+    /**
+     * Constructs a {@code SynthInternalFrameUI}.
+     * @param b an internal frame
+     */
     protected SynthInternalFrameUI(JInternalFrame b) {
         super(b);
     }
 
     /**