diff --git a/man2/quotactl.2 b/man2/quotactl.2
index 82406d440..3910379a3 100644
--- a/man2/quotactl.2
+++ b/man2/quotactl.2
@@ -285,9 +285,12 @@ struct dqinfo {         /* Defined since kernel 2.4.22 */
 
 /* Quota format QFMT_VFS_OLD */
 
-#define V1_DQF_RSQUASH	1   /* Root squash enabled */
+/* Before v4.0-rc1~141^2~14 it had been defined privately as V1_DQF_RSQUASH */
+#define DQF_ROOT_SQUASH (1 << 0)   /* Root squash enabled */
 
-/* Other quota formats have no dqi_flags bits defined */
+/* Quota format QFMT_VFS_V0 / QFMT_VFS_V1 */
+
+#define DQF_SYS_FILE    (1 << 16)  /* Quota stored in a system file */
 
 /* Flags in dqi_valid that indicate which fields in
    dqinfo structure are valid. */