diff --git a/platform/util/src/com/intellij/util/xmlb/SkipDefaultValuesSerializationFilters.java b/platform/util/src/com/intellij/util/xmlb/SkipDefaultValuesSerializationFilters.java
index 6bc5f00ab044..39e4cd83abe5 100644
--- a/platform/util/src/com/intellij/util/xmlb/SkipDefaultValuesSerializationFilters.java
+++ b/platform/util/src/com/intellij/util/xmlb/SkipDefaultValuesSerializationFilters.java
@@ -26,7 +26,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.Map;
 
 /**
- * Please use {@link SkipDefaultsSerializationFilter},
+ * Please use {@link SkipDefaultsSerializationFilter} if state class doesn't implement "equals" (in Kotlin use data classes {@see http://kotlinlang.org/docs/reference/data-classes.html})
  */
 public class SkipDefaultValuesSerializationFilters extends SerializationFilterBase {
   private final Map<Class<?>, Object> myDefaultBeans = new THashMap<Class<?>, Object>();