diff --git a/libisoburn/trunk/libisoburn/isoburn.c b/libisoburn/trunk/libisoburn/isoburn.c
index e5ebb3cf..d1eed224 100644
--- a/libisoburn/trunk/libisoburn/isoburn.c
+++ b/libisoburn/trunk/libisoburn/isoburn.c
@@ -1094,7 +1094,7 @@ int isoburn_igopt_set_system_area(struct isoburn_imgen_opts *opts,
    }
    memcpy(opts->system_area_data, data, 32768);
  }
- opts->system_area_options = options & 1;
+ opts->system_area_options = options & 3;
  return(1);
 }
 
diff --git a/libisoburn/trunk/libisoburn/libisoburn.h b/libisoburn/trunk/libisoburn/libisoburn.h
index f59aba1c..1624d015 100644
--- a/libisoburn/trunk/libisoburn/libisoburn.h
+++ b/libisoburn/trunk/libisoburn/libisoburn.h
@@ -1182,6 +1182,12 @@ int isoburn_igopt_get_scdbackup_tag(struct isoburn_imgen_opts *o,
                           area so that one partition is defined which begins
                           at the second 512-byte block of the image and ends
                           where the image ends.
+                          This works with and without system_area_data.
+                    bit1= apply isohybrid MBR patching to the system area.
+                          This works only with system area data from
+                          SYSLINUX plus an ISOLINUX boot image (see
+                          iso_image_set_boot_image()) and only if not bit0
+                          is set.
     @return 1 success, 0 no data to get, <0 failure
 */
 int isoburn_igopt_set_system_area(struct isoburn_imgen_opts *o,
diff --git a/libisoburn/trunk/xorriso/xorriso_timestamp.h b/libisoburn/trunk/xorriso/xorriso_timestamp.h
index 38aa7963..75fbf554 100644
--- a/libisoburn/trunk/xorriso/xorriso_timestamp.h
+++ b/libisoburn/trunk/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2010.04.10.150747"
+#define Xorriso_timestamP "2010.04.10.170927"