Add comments as suggested by Jan

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274885 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/zip/ZipOutputStream.java

@@ -214,6 +214,11 @@ public class ZipOutputStream extends FilterOutputStream {
     /**
      * Deflater object for output 
      *
+     * <p>This attribute is only protected to provide a level of API
+     * backwards compatibility.  This class used to extend {@link
+     * java.util.zip.DeflaterOutputStream DeflaterOutputStream} up to
+     * Revision 1.13.</p>
+     *
      * @since 1.14
      */
     protected Deflater def = new Deflater(Deflater.DEFAULT_COMPRESSION, true);
@@ -221,6 +226,11 @@ public class ZipOutputStream extends FilterOutputStream {
     /**
      * Deflater buffer
      *
+     * <p>This attribute is only protected to provide a level of API
+     * backwards compatibility.  This class used to extend {@link
+     * java.util.zip.DeflaterOutputStream DeflaterOutputStream} up to
+     * Revision 1.13.</p>
+     *
      * @since 1.14
      */
     protected byte[] buf = new byte[512];