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diff --git a/manpages/en/live-boot.7 b/manpages/en/live-boot.7
index 72184cc..e6bc73f 100644
--- a/manpages/en/live-boot.7
+++ b/manpages/en/live-boot.7
@@ -24,6 +24,31 @@ In addition, there are some more boot parameters to influence the behaviour, see
 
 .SS Configuration Files
 \fBlive\-boot\fR can be configured (but not activated) through configuration files. Those files can be placed either in the root filesystem itself (/etc/live/boot.conf, /etc/live/boot/*), or on the live media (live/boot.conf, live/boot/*).
+These environment variables can only be set in the configuration files:
+
+.TP
+\fBDISABLE_CDROM\fR=[\fIy\fR|\fIn\fR]
+Disable support for booting from CD-ROMs.  If set to '\fIy\fR' mkinitramfs will build an initramfs without the kernel modules for reading CD-ROMs.
+
+.TP
+\fBDISABLE_FAT\fR=[\fIy\fR|\fIn\fR]
+Disable support for booting from FAT file systems.  If set to '\fIy\fR' mkinitramfs will build an initramfs without the kernel module vfat and some nls_* modules.
+
+.TP
+\fBDISABLE_FUSE\fR=[\fIy\fR|\fIn\fR]
+Disable support for booting from FUSE-based file systems.  If set to '\fIy\fR' mkinitramfs will build an initramfs without the kernel module fuse and file systems that depend on it (like curlftpfs and httpfs2).
+
+.TP
+\fBDISABLE_NTFS\fR=[\fIy\fR|\fIn\fR]
+Disable support for booting from NTFS file systems.  If set to '\fIy\fR' mkinitramfs will build an initramfs without the kernel module ntfs.
+
+.TP
+\fBDISABLE_USB\fR=[\fIy\fR|\fIn\fR]
+Disable support for booting from USB devices.  If set to '\fIy\fR' mkinitramfs will build an initramfs without the kernel module sd_mod.
+
+.TP
+\fBMINIMAL\fR=[\fIy\fR|\fIn\fR]
+Build a minimal initramfs.  If set to '\fIy\fR' mkinitramfs will build an initramfs without some udev scripts and without rsync.
 
 .SH OPTIONS
 \fBlive\-boot\fR currently features the following parameters.
@@ -104,6 +129,8 @@ disables the "persistence" feature, useful if the bootloader (like syslinux) has
 Do not prompt to eject the live medium.
 .IP "\fBramdisk\-size\fR" 4
 This parameter defines a custom ramdisk size (it's the '\-o size' option of tmpfs mount). By default, there is no ramdisk size set, so the default of mount applies (currently 50% of available RAM). Note that this option has currently no effect when booting with toram.
+.IP "\fBoverlay\-size\fR=\fISIZE\fR" 4
+The size of the tmpfs mount (used for the upperdir union root mount) in bytes, and rounded up to entire pages. This option accepts a suffix % to limit the instance to that percentage of your physical RAM or a suffix k, m or g for Ki, Mi, Gi (binary kilo (kibi), binary mega (mebi) and binary giga (gibi)). By default, 50% of available RAM will be used.
 .IP "\fBswap=true\fR" 4
 This parameter enables usage of local swap partitions.
 .IP "\fBpersistence\fR" 4