diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80628bb..0d887b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,9 @@
 ## 0.3.0 (unreleased)
 
 ### Improvement
+
 - Update `h3` with `quinn-0.10` or higher.
+- Implement the session persistance function for load balancing using sticky cookie (initial implementation).
 
 ## 0.2.0
 
diff --git a/TODO.md b/TODO.md
index 3c44f82..3dbc6eb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,7 +4,6 @@
 - More flexible option for rewriting path
 - Refactoring
 - Unit tests
-- Implementing load-balancing of backend apps (currently it doesn't consider to maintain session but simply rotate in a certain fashion)
 - Options to serve custom http_error page.
 - Prometheus metrics
 - Documentation
@@ -13,4 +12,7 @@
   - Currently, we took the following approach (caveats)
     - For Http2 and 1.1, prepare `rustls::ServerConfig` for each domain name and hence client CA cert is set for each one.
     - For Http3, use aggregated `rustls::ServerConfig` for multiple domain names except for ones requiring client-auth. So, if a domain name is set with client authentication, http3 doesn't work for the domain.
+- Make the session-persistance option for load-balancing sophisticated. (mostly done in v0.3.0)
+  - add option for sticky cookie name
+  - add option for sticky cookie duration
 - etc.