diff --git a/docs/livemedia-creator.1 b/docs/livemedia-creator.1
index 9d1379e6..9cb578cd 100644
--- a/docs/livemedia-creator.1
+++ b/docs/livemedia-creator.1
@@ -11,6 +11,7 @@ livemedia-creator [-h]
     [--fs-label FS_LABEL]
     [--qcow2] [--qcow2-arg QCOW2_ARGS]
     [--compression] [--compress-arg]
+    [--live-rootfs-size LIVE_ROOTFS_SIZE]
     [--keep-image] [--no-virt] [--proxy PROXY]
     [--anaconda-arg ANACONDA_ARGS]
     [--armplatform ARMPLATFORM] [--location LOCATION]
@@ -195,6 +196,11 @@ Path to template to use for appliance data.
 \fB\-\-app\-file APP_FILE\fR
 Appliance template results file.
 
+.SH PXE\-LIVE ARGUMENTS:
+.TP
+\fB\-\-live\-rootfs\-size\fR
+Size of root filesystem of live image in GiB. By default approximate size of space used in root filesystem is used.
+
 .SH VIRT\-INSTALL ARGUMENTS:
 .TP
 \fB\-\-ram MEMORY\fR
diff --git a/src/pylorax/imgutils.py b/src/pylorax/imgutils.py
index f2702e41..232d91f5 100644
--- a/src/pylorax/imgutils.py
+++ b/src/pylorax/imgutils.py
@@ -98,7 +98,7 @@ def mkrootfsimg(rootdir, outfile, label, size=2, sysroot=""):
     :param str rootdir: Root directory
     :param str outfile: Path of output image file
     :param str label: Filesystem label
-    :param int size: Size of the image, if None computed automatically
+    :param int size: Size of the image in GiB, if None computed automatically
     :param str sysroot: path to system (deployment) root relative to physical root
     """
     if size:
diff --git a/src/sbin/livemedia-creator b/src/sbin/livemedia-creator
index 774b11e8..861e97d1 100755
--- a/src/sbin/livemedia-creator
+++ b/src/sbin/livemedia-creator
@@ -1035,7 +1035,7 @@ def make_image(opts, ks):
     return disk_img
 
 
-def make_live_images(opts, work_dir, root_dir, rootfs_image=None):
+def make_live_images(opts, work_dir, root_dir, rootfs_image=None, size=None):
     """
     Create live images from direcory or rootfs image
 
@@ -1061,7 +1061,7 @@ def make_live_images(opts, work_dir, root_dir, rootfs_image=None):
             shutil.copy2(rootfs_image, joinpaths(liveos_dir, "rootfs.img"))
     else:
         log.info("Creating live rootfs image")
-        mkrootfsimg(root_dir, joinpaths(liveos_dir, "rootfs.img"), "LiveOS", size=None, sysroot=sys_root)
+        mkrootfsimg(root_dir, joinpaths(liveos_dir, "rootfs.img"), "LiveOS", size=size, sysroot=sys_root)
 
     log.info("Packing live rootfs image")
     add_pxe_args = []
@@ -1202,7 +1202,6 @@ def main():
                              help="Compression binary for make-tar. xz, lzma, gzip, and bzip2 are supported. xz is the default.")
     image_group.add_argument("--compress-arg", action="append", dest="compress_args", default=[],
                              help="Arguments to pass to compression. Pass once for each argument")
-
     # Group of arguments for appliance creation
     app_group = parser.add_argument_group("appliance arguments")
     app_group.add_argument("--app-name", default=None,
@@ -1236,6 +1235,11 @@ def main():
                                    "once for each argument. NOTE: this "
                                    "overrides the default. (default: %s)" % (DRACUT_DEFAULT,))
 
+    # pxe to live arguments
+    pxelive_group = parser.add_argument_group("pxe to live arguments")
+    pxelive_group.add_argument("--live-rootfs-size", type=int, default=0,
+                                help="Size of root filesystem of live image in GiB")
+
     parser.add_argument("--title", default="Linux Live Media",
                         help="Substituted for @TITLE@ in bootloader config files")
     parser.add_argument("--project", default="Linux",
@@ -1442,7 +1446,8 @@ def main():
                             mounted_sysroot_boot_dir = None
                             if opts.ostree:
                                 mounted_sysroot_boot_dir = mount_boot_part_over_root(img_mount)
-                            result_dir = make_live_images(opts, work_dir, img_mount.mount_dir)
+                            size = opts.live_rootfs_size or None
+                            result_dir = make_live_images(opts, work_dir, img_mount.mount_dir, size=size)
                         finally:
                             if mounted_sysroot_boot_dir:
                                 umount(mounted_sysroot_boot_dir)