diff --git a/README.md b/README.md
index 0fdeefc..8a6ecc5 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,20 @@
 # learn-rust-by-building-ruff
+
+## Rebuild with Python
+Components:
+- [ ] Tokenizer (Lexer)
+- [ ] Parser
+
+main.rs
+cache.rs
+check.rs
+lib.rs
+linter.rs
+message.rs
+parser.rs
+
+## Rebuild with Rust
+
+Reference:
+Blog: https://compileralchemy.substack.com/p/ruff-internals-of-a-rust-backed-python
+Commit: