diff --git a/README.md b/README.md
index 6c6df6e..56153ce 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 Solutions to the 2017 Advent of Code (https://adventofcode.com/2017/), in Rust.
 Trying to strike a balance between performance and ease-of-writing, erring on the side of performance where necessary.
 
-Simple to use: just `cargo test --release` or `cargo test --bin day_1`, for example.
+Simple to use: just `cargo test --release` or `cargo test -p day_1`, for example.
+Some crates have Criterion benchmarks: `cargo bench`, or `cargo bench -p day_1`, for example.
 
 I'm certainly no expert in Rust; don't assume I've done anything in a sane way.