diff --git a/README.md b/README.md
index 517d912..586d877 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@
 [![crates.io](https://img.shields.io/crates/v/gba.svg)](https://crates.io/crates/gba)
 [![docs.rs](https://docs.rs/gba/badge.svg)](https://docs.rs/gba/latest/gba/)
 
+* [![Built with cargo-make](https://sagiegurari.github.io/cargo-make/assets/badges/cargo-make.svg)](https://sagiegurari.github.io/cargo-make)
+
 # gba
 
 A crate that helps you make GBA games
diff --git a/book/src/ch01/volatile.md b/book/src/ch01/volatile.md
index 92ce7e5..940e05b 100644
--- a/book/src/ch01/volatile.md
+++ b/book/src/ch01/volatile.md
@@ -22,9 +22,9 @@ operations are enforced to happen in the exact order that you specify them, but
 only relative to other volatile operations. So something like
 
 ```rust
-c.volatile_write(5);
+c.write_volatile(5);
 a += b;
-d.volatile_write(7);
+d.write_volatile(7);
 ```
 
 might end up changing `a` either before or after the change to `c` (since the