diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce9fa9b..7da1873 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,10 +7,14 @@
 -----
 
 - Mount Router by default, not need config now.
+
+  > IMPORTANT: Wen you upgrade this version, you need remove `mount RuCaptcha::Engine` line from your `config/routes.rb`
 - Default use [:file_store, 'tmp/cache/rucaptcha/session'] as RuCaptcha.config.cache_store, now it can work without any configurations.
 
 > NOTE: But you still need care about `config.cache_store` to setup on a right way.
 
+
+
 2.0.3
 -----