diff --git a/design/XFS_Filesystem_Structure/internal_inodes.asciidoc b/design/XFS_Filesystem_Structure/internal_inodes.asciidoc
index 5f4d622..40eb572 100644
--- a/design/XFS_Filesystem_Structure/internal_inodes.asciidoc
+++ b/design/XFS_Filesystem_Structure/internal_inodes.asciidoc
@@ -21,6 +21,9 @@
 [options="header"]
 |=====
 | Metadata File                                  | Location
+| xref:Quota_Inodes[User Quota]                  | /quota/user
+| xref:Quota_Inodes[Group Quota]                 | /quota/group
+| xref:Quota_Inodes[Project Quota]               | /quota/project
 | xref:Real-Time_Bitmap_Inode[Realtime Bitmap]   | /rtgroups/*.bitmap
 | xref:Real-Time_Summary_Inode[Realtime Summary] | /rtgroups/*.summary
 |=====
diff --git a/design/XFS_Filesystem_Structure/ondisk_inode.asciidoc b/design/XFS_Filesystem_Structure/ondisk_inode.asciidoc
index e289299..6e52e5f 100644
--- a/design/XFS_Filesystem_Structure/ondisk_inode.asciidoc
+++ b/design/XFS_Filesystem_Structure/ondisk_inode.asciidoc
@@ -199,6 +199,9 @@
 [source, c]
 ----
 enum xfs_metafile_type {
+     XFS_METAFILE_USRQUOTA,
+     XFS_METAFILE_GRPQUOTA,
+     XFS_METAFILE_PRJQUOTA,
      XFS_METAFILE_RTBITMAP,
      XFS_METAFILE_RTSUMMARY,
 };
diff --git a/design/XFS_Filesystem_Structure/superblock.asciidoc b/design/XFS_Filesystem_Structure/superblock.asciidoc
index bffb165..f045530 100644
--- a/design/XFS_Filesystem_Structure/superblock.asciidoc
+++ b/design/XFS_Filesystem_Structure/superblock.asciidoc
@@ -259,6 +259,9 @@
 | +XFS_PQUOTA_CHKD+		| Project quotas have been checked.
 |=====
 
+If the +XFS_SB_FEAT_INCOMPAT_METADIR+ feature is enabled, the +sb_qflags+ field
+will persist across mounts if no quota mount options are provided.
+
 *sb_flags*::
 Miscellaneous flags.