Add comment to README

Author: guibescos

README.md

@@ -107,3 +107,9 @@ root@pyth-dev# usermod -u 1002 -g 1004 -s /bin/bash pyth
 Finally, in docker extension inside VS Code click right and choose "Attach VS Code". If you're using a remote host in VS Code make sure to let this connection be open.
 
 To get best experience from C++ IntelliSense, open entire `/home/pyth` in VS Code to include `solana` directory in home for lookup directories.
+
+### pre-commit hooks
+pre-commit is a tool that checks and fixes simple issues (formatting, ...) before each commit. You can install it by following [their website](https://pre-commit.com/). In order to enable checks for this repo run `pre-commit install` from command-line in the root of this repo.
+
+The checks are also performed in the CI to ensure the code follows consistent formatting. Formatting is only currently enforced in the `program/` directory.
+You might also need to install the nightly toolchain to run the formatting by running `rustup toolchain install nightly`.