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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  */
 
 package java.lang;
 import java.lang.ref.*;
 
 /**
- * This class extends <tt>ThreadLocal</tt> to provide inheritance of values
+ * This class extends {@code ThreadLocal} to provide inheritance of values
  * from parent thread to child thread: when a child thread is created, the
  * child receives initial values for all inheritable thread-local variables
  * for which the parent has values.  Normally the child's values will be
  * identical to the parent's; however, the child's value can be made an
- * arbitrary function of the parent's by overriding the <tt>childValue</tt>
+ * arbitrary function of the parent's by overriding the {@code childValue}
  * method in this class.
  *
  * <p>Inheritable thread-local variables are used in preference to
  * ordinary thread-local variables when the per-thread-attribute being
  * maintained in the variable (e.g., User ID, Transaction ID) must be
  * automatically transmitted to any child threads that are created.
  *
+ * <p>Note: During the creation of a new {@link
+ * Thread#Thread(ThreadGroup,Runnable,String,long,boolean) thread}, it is
+ * possible to <i>opt out</i> of receiving initial values for inheritable
+ * thread-local variables.
+ *
  * @author  Josh Bloch and Doug Lea
  * @see     ThreadLocal
  * @since   1.2
  */
 
 public class InheritableThreadLocal<T> extends ThreadLocal<T> {
     /**
      * Computes the child's initial value for this inheritable thread-local
      * variable as a function of the parent's value at the time the child
      * thread is created.  This method is called from within the parent
      * thread before the child is started.
      * <p>
      * This method merely returns its input argument, and should be overridden
      * if a different behavior is desired.
      *
      * @param parentValue the parent thread's value
      * @return the child thread's initial value
      */
     protected T childValue(T parentValue) {
         return parentValue;
     }
 
     /**
      * Get the map associated with a ThreadLocal.
      *
      * @param t the current thread
      */
     ThreadLocalMap getMap(Thread t) {
        return t.inheritableThreadLocals;
     }
 
     /**
      * Create the map associated with a ThreadLocal.
      *
      * @param t the current thread
      * @param firstValue value for the initial entry of the table.
      */
     void createMap(Thread t, T firstValue) {
         t.inheritableThreadLocals = new ThreadLocalMap(this, firstValue);
     }
 }