diff --git a/extras/dev.nix b/extras/dev.nix
index d9ab1c3..e342dbe 100644
--- a/extras/dev.nix
+++ b/extras/dev.nix
@@ -43,10 +43,8 @@
 
     #rust
     bacon
-    # cargo-edit
-    # cargo-feature
-    # cargo-rr
     elf2uf2-rs
+    mdbook
     mold-wrapped
     rustup
     sccache