diff --git a/src/test/resources/com/puppycrawl/tools/checkstyle/checks/design/InetSocketAddress.java b/src/test/resources/com/puppycrawl/tools/checkstyle/checks/design/InetSocketAddress.java
index da5b39799..2c27378d0 100644
--- a/src/test/resources/com/puppycrawl/tools/checkstyle/checks/design/InetSocketAddress.java
+++ b/src/test/resources/com/puppycrawl/tools/checkstyle/checks/design/InetSocketAddress.java
@@ -1,5 +1,6 @@
 package com.puppycrawl.tools.checkstyle.checks.design;
-
+// ATTENTION: we need name of this class to be without "Input" prefix to as we
+// need the same name as defined at VisibilityModifierCheck.DEFAULT_IMMUTABLE_TYPES
 public class InetSocketAddress
 {
     class Arrays {