diff --git a/rootfs/doc.go b/rootfs/doc.go
index bcc04a6..2c6844e 100644
--- a/rootfs/doc.go
+++ b/rootfs/doc.go
@@ -5,30 +5,31 @@
 // It will also reasonably process those files.
 //
 // == Non-directory will be copied only once ==
+//
 // A non-directory will be copied only once, only from within it's past
 // occurrence. I.e. if file /a/b was found in layers 0 and 2, only the file
 // from layer 2 will be used.
 // Directories will always be copied, even if there are duplicates. This is
 // to avoid a situation like this:
 //   layer0:
-//   - ./dir/
-//   - ./dir/file
+//     ./dir/
+//     ./dir/file
 //   layer1:
-//   - ./dir/
-//   - ./dir/file
+//     ./dir/
+//     ./dir/file
 // In theory, the directory from layer 1 takes precedence, so a tarball like
 // this could be created:
-// - ./dir/      (from layer1)
-// - ./dir/file1 (from layer1)
+//   ./dir/      (from layer1)
+//   ./dir/file1 (from layer1)
 // However, imagine the following:
 //   layer0:
-//   - ./dir/
-//   - ./dir/file1
+//     ./dir/
+//     ./dir/file1
 //   layer1:
-//   - ./dir/
+//     ./dir/
 // Then the resulting tarball would have:
-// - ./dir/file1 (from layer1)
-// - ./dir/      (from layer0)
+//   ./dir/file1 (from layer1)
+//   ./dir/      (from layer0)
 // Which would mean `untar` would try to untar a file to a directory which
 // was not yet created. Therefore directories will be copied to the resulting
 // tar in the order they appear in the layers.
@@ -44,21 +45,22 @@
 //
 // From mount.aufs(8)[1]:
 //
-// The whiteout is for hiding files on lower branches. Also it is applied to
-// stop readdir going lower branches. The latter case is called ‘opaque
-// directory.’ Any whiteout is an empty file, it means whiteout is just an
-// mark. In the case of hiding lower files, the name of whiteout is
-// ‘.wh.<filename>.’ And in the case of stopping readdir, the name is
-// ‘.wh..wh..opq’. All whiteouts are hardlinked, including ‘<writable branch
-// top dir>/.wh..wh.aufs`.
+//   The whiteout is for hiding files on lower branches. Also it is applied to
+//   stop readdir going lower branches. The latter case is called ‘opaque
+//   directory.’ Any whiteout is an empty file, it means whiteout is just an
+//   mark. In the case of hiding lower files, the name of whiteout is
+//   ‘.wh.<filename>.’ And in the case of stopping readdir, the name is
+//   ‘.wh..wh..opq’. All whiteouts are hardlinked, including ‘<writable branch
+//   top dir>/.wh..wh.aufs`.
 //
 // My interpretation:
-// - a file/hardlink called `.wh..wh..opq` means that directory contents from
+//
+// 1. a file/hardlink called `.wh..wh..opq` means that directory contents from
 // the layers below the mentioned file should be ignored. Higher layers may add
-// files on top.
-//   * Ambiguity: should the directory from the lower layers be removed? I am
-//     assuming yes, but this assumptions is baseless.
-// - if file/hardlink `.wh.([^/]+)` is found, $1 should be deleted from the
+// files on top. Ambiguity: should the directory from the lower layers be
+// removed? I am assuming yes, but this assumptions is baseless.
+//
+// 2. if file/hardlink `.wh.([^/]+)` is found, $1 should be deleted from the
 // current and lower layers.
 //
 // Note: these may be regular files in practice. So this implementation will
@@ -71,5 +73,6 @@
 // problems reading it[2].
 //
 // [1]: https://manpages.debian.org/unstable/aufs-tools/mount.aufs.8.en.html
+//
 // [2]: https://mgorny.pl/articles/portability-of-tar-features.html
 package rootfs