src/java.base/share/classes/java/lang/Object.java

@@ -30,10 +30,14 @@
  
  /**
   * Class {@code Object} is the root of the class hierarchy.
   * Every class has {@code Object} as a superclass. All objects,
   * including arrays, implement the methods of this class.
+  * <p>
+  * Subclasses of {@code java.lang.Object} can be either an {@linkplain Class#isIdentity identity class}
+  * or a {@linkplain Class#isValue value class}.
+  * See {@jls The Java Language Specification 8.1.1.5 value Classes}.
   *
   * @see     java.lang.Class
   * @since   1.0
   */
  public class Object {