src/java.desktop/share/classes/javax/swing/plaf/ActionMapUIResource.java

@@ -35,8 +35,11 @@
  * @author Scott Violet
  * @since 1.3
  */
 @SuppressWarnings("serial") // Superclass is not serializable across versions
 public class ActionMapUIResource extends ActionMap implements UIResource {
+    /**
+     * Constructs an {@code ActionMapUIResource}.
+     */
     public ActionMapUIResource() {
     }
 }