diff --git a/README.md b/README.md
index 74baaad..ffe3f32 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,8 @@ const File = struct {
     magic: [4]u8,
     version: u4,
     padding: u4,
-    num_shells: u8,
+    num_shells: u6,
+    padding: u2,
     num_users: u32,
     num_groups: u32,
     offset_cmph_gid2group: u26,