Depreacte CopyUtils 0-argument contructor
diff --git a/src/main/java/org/apache/commons/io/CopyUtils.java b/src/main/java/org/apache/commons/io/CopyUtils.java
index da01a98..55e0494 100644
--- a/src/main/java/org/apache/commons/io/CopyUtils.java
+++ b/src/main/java/org/apache/commons/io/CopyUtils.java
@@ -349,7 +349,12 @@
 
     /**
      * Instances should NOT be constructed in standard programming.
+     *
+     * @deprecated TODO Make private in 4.0.
      */
-    public CopyUtils() { }
+    @Deprecated
+    public CopyUtils() {
+        // empty
+    }
 
 }