diff --git a/releng/releng_build_isojigdo b/releng/releng_build_isojigdo
index 5a2a540d..913bfe90 100755
--- a/releng/releng_build_isojigdo
+++ b/releng/releng_build_isojigdo
@@ -27,7 +27,7 @@ Usage:
  ISOLINUX_BIN=/path/to/isolinux.bin
  BOOT_CAT=/path/to/boot.cat
 # without using a config file
- $0 xorriso_cmd IN_dir OUT_image [IN_isolinux] [IN_bootcat] [-clean]
+ $0 xorriso_cmd IN_dir OUT_image [IN_isolinux] [OUT_bootcat] [-clean]
 HLP
 }
 
@@ -70,7 +70,7 @@ fi
 # all must be set at this point
 printf "$0: Config items:"
 printf "\n\txorriso_cmd=${XOR}\n\tIN_dir=${DIR}\n\tOUT_image=${IMG}.iso"
-printf "\n\tIN_isolinux=${ISOLINUX_BIN}\n\tIN_bootcat=${BOOT_CAT}\n"
+printf "\n\tIN_isolinux=${ISOLINUX_BIN}\n\tOUT_bootcat=${BOOT_CAT}\n"
 RES="${IMG}.iso ${IMG}.new ${IMG}.md5 ${IMG}.jigdo ${IMG}.template"
 ############################################################
 main() {
@@ -106,15 +106,16 @@ CMD="${XOR} \
  -partition_offset 16 \
  -J -joliet-long \
 "
+
 # boot section TODO
-#if [ "${5}" -a "${6}" ]; then
+#if [ "${ISOLINUX_BIN}" -a "${BOOT_CAT}" ]; then
 #CMD+=\
-# -b boot/isolinux/isolinux.bin \                     # $5
-# -c boot/boot.cat \                                  # $6
+# -b ${ISOLINUX_BIN} \                                # NOTE: boot/isolinux/isolinux.bin
+# -c ${BOOT_CAT} \                                    # NOTE: boot/boot.cat
 # -no-emul-boot -boot-load-size 4 -boot-info-table \
 # -isohybrid-mbr somembr.sysarea \                    # TODO: figure out where to grab one
 # -partition_offset 16 \
-# -append_partition 2 0x01 fatpart.fat \
+# -append_partition 2 0x01 fatpart.fat \              # TODO: create one unconditionally?
 #fi
 
 # jigdo section
@@ -149,8 +150,6 @@ else
  exit 1
 fi
 
-
-
 # trap the exit code of diff and let the Universe explode
 diff ${IMG}.iso ${IMG}.new
 DIFF_RET="$?"