diff --git a/ChangeLog.md b/ChangeLog.md
index cdb01bf..535ce00 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # CppJieba ChangeLog
 
+## next version
+
+1. 新增可动态增加词典的API: insertUserWord
+2. cut函数增加默认参数，默认使用Mix切词算法。关于切词算法详见README.md
+
 ## v3.0.1
 
 1. 提升兼容性，修复在某些特定环境下的编译错误问题。 
diff --git a/src/Application.hpp b/src/Application.hpp
index c51a62a..3e8f104 100644
--- a/src/Application.hpp
+++ b/src/Application.hpp
@@ -36,7 +36,7 @@ class Application {
                  stopWordsPath) {
   }
   void cut(const string& sentence, vector<string>& words, 
-        CutMethod method) const {
+        CutMethod method = METHOD_MIX) const {
     switch(method) {
       case METHOD_MP:
         mpSeg_.cut(sentence, words);
@@ -57,6 +57,9 @@ class Application {
         LogError("argument method is illegal.");
     }
   }
+  void insertUserWord(const string& word, const string& tag = UNKNOWN_TAG) {
+    dictTrie_.insertUserWord(word, tag);
+  }
   void tag(const string& str, vector<pair<string, string> >& res) const {
     tagger_.tag(str, res);
   }
diff --git a/test/unittest/TApplication.cpp b/test/unittest/TApplication.cpp
index 00f1bcf..3023a51 100644
--- a/test/unittest/TApplication.cpp
+++ b/test/unittest/TApplication.cpp
@@ -11,6 +11,10 @@ TEST(ApplicationTest, Test1) {
                             "../dict/stop_words.utf8");
   vector<string> words;
   string result;
+
+  app.cut("他来到了网易杭研大厦", words);
+  result << words;
+  ASSERT_EQ("[\"他\", \"来到\", \"了\", \"网易\", \"杭研\", \"大厦\"]", result);
   
   app.cut("我来自北京邮电大学。", words, METHOD_MP);
   result << words;
@@ -46,3 +50,11 @@ TEST(ApplicationTest, Test1) {
   result << keywordres;
   ASSERT_EQ(result, "[\"CEO:11.7392\", \"升职:10.8562\", \"加薪:10.6426\", \"手扶拖拉机:10.0089\", \"巅峰:9.49396\"]");
 }
+
+//TEST(ApplicationTest, InsertUserWord) {
+//  CppJieba::Application app("../dict/jieba.dict.utf8",
+//                            "../dict/hmm_model.utf8",
+//                            "../dict/user.dict.utf8",
+//                            "../dict/idf.utf8",
+//                            "../dict/stop_words.utf8");
+//}