diff --git a/filesystem/squashfs_superblock.ksy b/filesystem/squashfs_superblock.ksy
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+meta:
+  id: squashfs_superblock
+  title: SquashFS superblock
+  file-extension:
+    - squashfs
+    - snap
+    - sqfs
+  endian: le
+  license: CC0-1.0
+  xref:
+    wikidata: Q389314
+doc: |
+  SquashFS is a compressed filesystem in a file, that can be read-only
+  accessed from low memory devices. It is popular for booting LiveCDs and
+  packing self-contained binaries. SquashFS format is used by Ubuntu .snap
+  packages. SquashFS is natively supported by Linux Kernel.
+doc-ref: https://github.com/AgentD/squashfs-tools-ng/blob/master/doc/format.txt
+seq:
+  - id: superblock
+    type: superblock
+enums:
+  compressor:
+    1: gzip
+    2: lzo
+    3: lzma
+    4: xz
+    5: lz4
+    6: zstd
+types:
+  flags:
+    seq:
+      # bit count starts from the largest, byte count form the smallest
+      - id: nfs_export_table            # 0x0080
+        type: b1
+      - id: data_deduplicated           # 0x0040
+        type: b1
+      - id: fragments_always_generated  # 0x0020
+        type: b1
+      - id: fragments_not_used          # 0x0010
+        type: b1
+      - id: fragments_uncompresed       # 0x0008
+        type: b1
+      - type: b1                        # 0x0004 bit is unused
+      - id: data_blocks_uncompresed     # 0x0002
+        type: b1
+      - id: inodes_uncompresed          # 0x0001
+        type: b1
+      # bits 0x0100 are below, starting from the largest
+      - type: b4                        # bits 11110000 are unused
+      - id: id_table_uncompresed        # 0x0800
+        type: b1
+      - id: compressor_options_present  # 0x0400
+        type: b1
+      - id: xattrs_absent               # 0x0200
+        type: b1
+      - id: xattrs_uncompressed         # 0x0100
+        type: b1
+  superblock:
+    seq:
+      - id: magic
+        contents: 'hsqs'
+      - id: inode_count
+        type: u4
+      - id: mod_time
+        type: u4
+        doc: Unix times of last modification.
+      - id: block_size
+        type: u4
+        doc: |
+          The size of a data block in bytes. Must be a power of two between
+          4096 (4k) and 1048576 (1 MiB).
+      - id: frag_count
+        type: u4
+        doc: The number of entries in the fragment table.
+      - id: compressor
+        type: u2
+        enum: compressor
+        doc: Compressor used for both data and meta data blocks.
+      - id: block_log
+        type: u2
+        doc: |
+          The log2 of the block size. If the two fields do not agree, the
+          archive is considered corrupted.
+      - id: flags
+        type: flags
+      - id: id_count
+        type: u2
+        doc: The number of entries in the ID lookup table.
+      - id: version_major
+        type: u2
+        valid:
+          eq: 4
+      - id: version_minor
+        type: u2
+        valid:
+          eq: 0
+      - id: root_inode_ref
+        type: u8
+        doc: A reference to the inode of the root directory.
+      - id: bytes_used
+        type: u8
+        doc: |
+          The number of bytes used by the archive. Because SquashFS
+          archives must be padded to a multiple of the underlying device
+          block size, this can be less than the actual file size.
+      - id: id_table_start
+        type: u8
+      - id: xattr_id_table_start
+        type: u8
+      - id: inode_table_start
+        type: u8
+      - id: directory_table_start
+        type: u8
+      - id: fragment_table_start
+        type: u8
+      - id: export_table_start
+        type: u8