diff --git a/Cargo.toml b/Cargo.toml
index d099971..7918067 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "gba"
 description = "A crate (and book) for making GBA games with Rust."
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Lokathor <zefria@gmail.com>", "Thomas Winwood <twwinwood@gmail.com>"]
 repository = "https://github.com/rust-console/gba"
 readme = "README.md"
diff --git a/src/lib.rs b/src/lib.rs
index 8d9f9c2..240d76a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,5 @@
 #![cfg_attr(not(test), no_std)]
 #![feature(asm)]
-#![feature(const_int_wrapping)]
-#![feature(const_int_rotate)]
 #![feature(cfg_target_vendor)]
 #![allow(clippy::cast_lossless)]
 #![deny(clippy::float_arithmetic)]
@@ -129,6 +127,15 @@ pub mod sram;
 
 pub mod mgba;
 
+extern "C" {
+  /// This marks the end of the `.data` and `.bss` sections in IWRAM.
+  ///
+  /// Memory in IWRAM _before_ this location is not free to use, you'll trash
+  /// your globals and stuff. Memory here or after is freely available for use
+  /// (careful that you don't run into your own stack of course).
+  static __bss_end: u8;
+}
+
 newtype! {
   /// A color on the GBA is an RGB 5.5.5 within a `u16`
   #[derive(PartialOrd, Ord, Hash)]
diff --git a/src/mgba.rs b/src/mgba.rs
index 24e6648..8f5caa7 100644
--- a/src/mgba.rs
+++ b/src/mgba.rs
@@ -1,4 +1,8 @@
 //! Special utils for if you're running on the mGBA emulator.
+//!
+//! Note that this assumes that you're using the very latest version (0.7-beta1
+//! at the time of this writing). If you've got some older version of things
+//! there might be any number of differences or problems.
 
 use super::*;
 
@@ -6,6 +10,7 @@ use super::*;
 #[repr(u16)]
 #[allow(missing_docs)]
 pub enum MGBADebugLevel {
+  /// Warning! This causes the emulator to halt emulation!
   Fatal = 0,
   Error = 1,
   Warning = 2,
@@ -51,9 +56,12 @@ impl MGBADebug {
   pub fn send(&mut self, level: MGBADebugLevel) {
     if level == MGBADebugLevel::Fatal {
       Self::SEND_ADDRESS.write(Self::SEND_FLAG | MGBADebugLevel::Error as u16);
+
+      // Note(Lokathor): A Fatal send causes the emulator to halt!
       Self::SEND_ADDRESS.write(Self::SEND_FLAG | MGBADebugLevel::Fatal as u16);
     } else {
       Self::SEND_ADDRESS.write(Self::SEND_FLAG | level as u16);
+      self.bytes_written = 0;
     }
   }
 }