diff --git a/README.md b/README.md
index 88babdf..e6df071 100644
--- a/README.md
+++ b/README.md
@@ -147,9 +147,12 @@ sudo apt install -y clang mold pkg-config libssl-dev \
 mise trust
 mise install              # Install all dev tools
 mise run install-e2e      # Install Chrome for Testing + ChromeDriver
+uv tool install prek      # Install prek (git hook runner) as a standalone tool
 prek install              # Install git hooks
 ```
 
+> **Note:** `prek` is a standalone binary installed via [`uv`](https://docs.astral.sh/uv/) and must be on `PATH`. If it is missing, `prek run -av` cannot invoke `cargo fmt -- --check` and reports `failed to run cargo fmt -- --check` — this is the missing `prek`/toolchain, not a formatting error. Installing `prek` resolves it.
+
 ## Contributing
 
 ```bash