diff --git a/libisoburn/isoburn.c b/libisoburn/isoburn.c
index b6f50378..83e306c2 100644
--- a/libisoburn/isoburn.c
+++ b/libisoburn/isoburn.c
@@ -7,7 +7,7 @@
   Class core of libisoburn.
 
   Copyright 2007 - 2009 Vreixo Formoso Lopes <metalpain2002@yahoo.es>
-  Copyright 2007 - 2020 Thomas Schmitt <scdbackup@gmx.net>
+  Copyright 2007 - 2021 Thomas Schmitt <scdbackup@gmx.net>
 
   Provided under GPL version 2 or later.
 */
@@ -1549,7 +1549,7 @@ int isoburn_igopt_set_system_area(struct isoburn_imgen_opts *opts,
    }
    memcpy(opts->system_area_data, data, 32768);
  }
- opts->system_area_options = options & 0xffff;
+ opts->system_area_options = options & 0x3ffff;
  return(1);
 }
 
diff --git a/libisoburn/libisoburn.h b/libisoburn/libisoburn.h
index ef4a1012..d0f82e15 100644
--- a/libisoburn/libisoburn.h
+++ b/libisoburn/libisoburn.h
@@ -1585,8 +1585,10 @@ int isoburn_igopt_get_scdbackup_tag(struct isoburn_imgen_opts *o,
 /** Attach 32 kB of binary data which shall get written to the first 32 kB
     of the ISO image, the System Area.
     options can cause manipulations of these data before writing happens.
-    If system area data are giveni or options bit0 is set, then bit1 of
+    If system area data are given or options bit0 is set, then bit1 of
     el_torito_set_isolinux_options() is automatically disabled.
+    (For the meaning of options see also in libisofs.h
+     iso_write_opts_set_system_area() parameter "options".)
     @since 0.5.4
     @param o        The option set to work on
     @param data     Either NULL or 32 kB of data. Do not submit less bytes !
@@ -1655,6 +1657,20 @@ int isoburn_igopt_get_scdbackup_tag(struct isoburn_imgen_opts *o,
                           Little-endian 8-byte.
                           Should be combined with options bit0.
                           Will not be in effect if options bit1 is set.
+                    bit15= Only with System area type MBR but not with CHRP
+                          @since 1.4.4
+                          Enforce MBR "bootable/active" flag. In worst case by
+                          dummy partition of type 0x00 which occupies block 0.
+                    bit16= "Legacy BIOS bootable" in GPT
+                          @since 1.5.6
+                          If this bit is set and a GPT partition for the
+                          ISO 9660 filesystem gets written, then set the GPT
+                          partition flags bit 2 "Legacy BIOS bootable".
+                    bit17= ISO not read-only
+                          @since 1.5.6
+                          Do not set GPT partition flag bit 60 "read-only" for
+                          the ISO 9660 filesystem partition, if such a
+                          partition gets written.
     @return 1 success, 0 no data to get, <0 failure
 */
 int isoburn_igopt_set_system_area(struct isoburn_imgen_opts *o,
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index a5bafb7e..0df206ae 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2021.04.04.181609"
+#define Xorriso_timestamP "2021.05.25.191333"