diff --git a/Cargo.toml b/Cargo.toml
index c3e3b4d..767a3c8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ rp-pico = "0.7"
 # sparkfun-pro-micro-rp2040 = "0.3"
 
 # If you're not going to use a Board Support Package you'll need these:
-# rp2040-hal = { version="0.8", features=["rt"] }
+# rp2040-hal = { version="0.8", features=["rt", "critical-section-impl"] }
 # rp2040-boot2 = "0.2"
 
 # cargo build/run