Javadoc
diff --git a/src/main/java/org/apache/commons/io/input/ProxyInputStream.java b/src/main/java/org/apache/commons/io/input/ProxyInputStream.java
index 0d05c9e..c412d04 100644
--- a/src/main/java/org/apache/commons/io/input/ProxyInputStream.java
+++ b/src/main/java/org/apache/commons/io/input/ProxyInputStream.java
@@ -39,6 +39,9 @@
  * <li>notify a subclass that an exception was caught through {@link #handleIOException(IOException)}</li>
  * <li>{@link #unwrap()} itself</li>
  * </ul>
+ * <p>
+ * This class does not add any state (no additional instance variables).
+ * </p>
  */
 public abstract class ProxyInputStream extends FilterInputStream {