Add ext2 superblock, document file system
diff --git a/doc/build.rst b/doc/build.rst
index aefa6bf..3826238 100644
--- a/doc/build.rst
+++ b/doc/build.rst
@@ -36,4 +36,4 @@
     gcc gcc-multilib nasm qemu-system-i386 make m4 python3 awk
 
 There are some additional dependencies for building a GRUB ISO but I don't
-remember them at the time of writing.
\ No newline at end of file
+remember them at the time of writing.