diff --git a/configuration.nix b/configuration.nix
index 17d2a26..cde90c1 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -1,13 +1,17 @@
 { config, lib, ... }:
 
-# This should be in /etc/nixos/ together with the rest.
+/*
+  This should be in /etc/nixos/ together with the rest.
 
-# For the nixos channel
-# nix-channel --add https://channels.nixos.org/nixos-unstable nixos && nix-channel --update
+  For the nixos channel:
+  sudo nix-channel --add https://channels.nixos.org/nixos-unstable nixos && nix-channel --update
 
-# To fix problems sometimes:
-# sudo nixos-rebuild switch -I nixos-config=/etc/nixos/configuration.nix
+  To rebuild for the first time:
+  sudo nixos-rebuild switch --option extra-experimental-features "blake3-hashes"
 
+  To fix problems sometimes:
+  sudo nixos-rebuild switch -I nixos-config=/etc/nixos/configuration.nix
+*/
 let
   nixtamal = import ./tamal {
     bootstrap-nixpkgs = <nixpkgs>; # Apparently a little bit impure but faster. (can be removed)
diff --git a/local.nix b/local.nix
index c7cc52a..1b06ae2 100644
--- a/local.nix
+++ b/local.nix
@@ -61,11 +61,11 @@ in
   options = [
     "compress_algorithm=lzo-rle"
     "compress_extension=*"
-    "nocompress_extension=avif,bmp,gif,heic,heif,ico,jpe,jpeg,jpg,png,svg,tif,tiff,webp,3gp,avi,flv,m4v,mkv,mov,mp4,mpeg,mpg,webm,wmv,aac,flac,m4a,mid,midi,mp3,ogg,opus,wav,wma,7z,bz2,gz,rar,tar,tgz,xz,zip,zst,docx,odt,odp,ods,pptx,xlsx,pdf,db,gpg,key,p12,pem,sqlite,sqlite3,enc,aab,apk,appimage,bin,deb,dll,elf,exe,jar,so,rpm,img,iso,qcow2,vdi,vhd,vmdk,otf,ttf,class,dump,log,swp,tmp,bak,cache,part,old,new,core"
+    #"nocompress_extension=avif,bmp,gif,heic,heif,ico,jpe,jpeg,jpg,png,svg,tif,tiff,webp,3gp,avi,flv,m4v,mkv,mov,mp4,mpeg,mpg,webm,wmv,aac,flac,m4a,mid,midi,mp3,ogg,opus,wav,wma,7z,bz2,gz,rar,tar,tgz,xz,zip,zst,docx,odt,odp,ods,pptx,xlsx,pdf,db,gpg,key,p12,pem,sqlite,sqlite3,enc,aab,apk,appimage,bin,deb,dll,elf,exe,jar,so,rpm,img,iso,qcow2,vdi,vhd,vmdk,otf,ttf,class,dump,log,swp,tmp,bak,cache,part,old,new,core"
     "compress_chksum"
     "atgc"
     "gc_merge"
-    "checkpoint=enable",
+    "checkpoint=enable"
     "checkpoint_merge"
     "fsync_mode=posix"
     "nat_bits"