diff --git a/TODO.md b/TODO.md
index 90fb79d..81af1d5 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,11 +4,18 @@
 - More flexible option for rewriting path
 - Refactoring
 
-  Split `backend` module into three parts
+  - Split `backend` module into three parts
 
-  - backend(s): struct containing info, defined for each served domain with multiple paths
-  - upstream/upstream group: information on targeted destinations for each set of (a domain + a path)
-  - load-balance: load balancing mod for a domain + path
+    - backend(s): struct containing info, defined for each served domain with multiple paths
+    - upstream/upstream group: information on targeted destinations for each set of (a domain + a path)
+    - load-balance: load balancing mod for a domain + path
+
+  - Split `rpxy` source codes into `rpxy-lib` and `rpxy-bin` to make the core part (reverse proxy) isolated from the misc part like toml file loader. This is in order to make the configuration-related part more flexible (related to [#33](https://github.com/junkurihara/rust-rpxy/issues/33))
+
+- Cache option for the response with `Cache-Control: public` header directive ([#55](https://github.com/junkurihara/rust-rpxy/issues/55))
+- Consideration on migrating from `quinn` and `h3-quinn` to other QUIC implementations ([#57](https://github.com/junkurihara/rust-rpxy/issues/57))
+- Benchmark with other reverse proxy implementations like Sozu ([#58](https://github.com/junkurihara/rust-rpxy/issues/58))
+  - Currently, Sozu can work only on `amd64` format due to its HTTP message parser limitation... Since the main developer have only `arm64` (Apple M1) laptops, so we should do that on VPS?
 
 - Unit tests
 - Options to serve custom http_error page.