diff --git a/README.md b/README.md
index b7b6b3b..1edbd5e 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,10 @@
 ## next features
 
 1. fix bugs
-2. controls
+2. compress output data size
+3. usage mode
+4. unit test
+5. controls
 
 ## install