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+The project is in its early stages: contributions are welcome and would be
+**very** helpful, but the project is not _yet_ optimized for contribution.
+Moreover, it is doubly experimental, so there's no guarantee that any work here
+would reach production.
+
+To get an idea of how rust-analyzer works, take a look at the [ARCHITECTURE.md](./ARCHITECTURE.md)
+document.
+
+Useful labels on the issue tracker:
+  * [E-mentor](https://github.com/rust-analyzer/rust-analyzer/issues?q=is%3Aopen+is%3Aissue+label%3AE-mentor)
+    issues have links to the code in question and tests,
+  * [E-easy](https://github.com/rust-analyzer/rust-analyzer/issues?q=is%3Aopen+is%3Aissue+label%3AE-easy),
+    [E-medium](https://github.com/rust-analyzer/rust-analyzer/issues?q=is%3Aopen+is%3Aissue+label%3AE-medium),
+    [E-hard](https://github.com/rust-analyzer/rust-analyzer/issues?q=is%3Aopen+is%3Aissue+label%3AE-hard),
+    labels are *estimates* for how hard would be to write a fix.
+
+There's no formal PR check list: everything that passes CI (we use [bors](https://bors.tech/)) is valid,
+but it's a good idea to write nice commit messages, test code thoroughly, maintain consistent style, etc.