diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index f62fa633..041c8175 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -26,7 +26,6 @@ more information and coordination
   - [Panicking](./start/panicking.md)
   - [Exceptions](./start/exceptions.md)
   - [Interrupts](./start/interrupts.md)
-  - [IO](./start/io.md)
 - [Peripherals](./peripherals/index.md)
     - [A first attempt in Rust](./peripherals/a-first-attempt.md)
     - [The Borrow Checker](./peripherals/borrowck.md)
diff --git a/src/start/io.md b/src/start/io.md
deleted file mode 100644
index 7febc026..00000000
--- a/src/start/io.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# IO
-
-> **TODO** Cover memory mapped I/O using registers.