diff --git a/src/main/java/ru/objectsfill/core/RandomValueFieldSetterCallback.java b/src/main/java/ru/objectsfill/core/RandomValueFieldSetterCallback.java
index ce1f2c4..e4e3119 100644
--- a/src/main/java/ru/objectsfill/core/RandomValueFieldSetterCallback.java
+++ b/src/main/java/ru/objectsfill/core/RandomValueFieldSetterCallback.java
@@ -118,6 +118,7 @@ private Optional<Fill> getExtendedParameterForField(Field field) {
      * get fields by class or name
      *
      * @param field The field to process.
+     * @return get fields by class or name
      */
     public static Predicate<Extend> getExtendPredicate(Field field) {
         return fillFieldParameter -> {
diff --git a/src/main/java/ru/objectsfill/object_param/Extend.java b/src/main/java/ru/objectsfill/object_param/Extend.java
index 830f732..4bc5be0 100644
--- a/src/main/java/ru/objectsfill/object_param/Extend.java
+++ b/src/main/java/ru/objectsfill/object_param/Extend.java
@@ -93,6 +93,7 @@ public static FillFieldParametersBuilder clazz(Class<?> clazz) {
 
     /**
      start function builder
+     @param singleChangeFunction mutation function
      @return fill field parameter builder.
      */
     public static FillFieldParametersBuilder wrapByFunction(UnaryOperator<Object> singleChangeFunction) {