diff --git a/MAINTAINERS b/MAINTAINERS
index b6a4b5d04d..1c98029754 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -762,6 +762,7 @@ S:	Maintained
 T:	git https://source.denx.de/u-boot/custodians/u-boot-efi.git
 F:	doc/api/efi.rst
 F:	doc/develop/uefi/*
+F:	doc/mkeficapsule.1
 F:	doc/usage/bootefi.rst
 F:	drivers/rtc/emul_rtc.c
 F:	include/capitalization.h
diff --git a/doc/mkeficapsule.1 b/doc/mkeficapsule.1
new file mode 100644
index 0000000000..680362f5c4
--- /dev/null
+++ b/doc/mkeficapsule.1
@@ -0,0 +1,99 @@
+.\" SPDX-License-Identifier: GPL-2.0+
+.\" Copyright (c) 2021, Linaro Limited
+.\" 		written by AKASHI Takahiro <takahiro.akashi@linaro.org>
+.TH MAEFICAPSULE 1 "May 2021"
+
+.SH NAME
+mkeficapsule \- Generate EFI capsule file for U-Boot
+
+.SH SYNOPSIS
+.B mkeficapsule
+.RI [ options "] " capsule-file
+
+.SH "DESCRIPTION"
+.B mkeficapsule
+command is used to create an EFI capsule file for use with the U-Boot
+EFI capsule update.
+A capsule file may contain various type of firmware blobs which
+are to be applied to the system and must be placed in the specific
+directory on the UEFI system partition.
+An update will be automatically executed at next reboot.
+
+Optionally, a capsule file can be signed with a given private key.
+In this case, the update will be authenticated by verifying the signature
+before applying.
+
+.B mkeficapsule
+supports two different format of image files:
+.TP
+.I raw image
+format is a single binary blob of any type of firmware.
+
+.TP
+.I FIT (Flattened Image Tree) image
+format is the same as used in the new uImage format and allows for
+multiple binary blobs in a single capsule file.
+This type of image file can be generated by
+.BR mkimage .
+
+.SH "OPTIONS"
+One of
+.BR --fit " or " --raw
+option must be specified.
+
+.TP
+.BI "-f\fR,\fB --fit " fit-image-file
+Specify a FIT image file
+
+.TP
+.BI "-r\fR,\fB --raw " raw-image-file
+Specify a raw image file
+
+.TP
+.BI "-i\fR,\fB --index " index
+Specify an image index
+
+.TP
+.BI "-I\fR,\fB --instance " instance
+Specify a hardware instance
+
+.TP
+.BR -h ", " --help
+Print a help message
+
+.PP
+With signing,
+.BR --private-key ", " --certificate " and " --monotonic-count
+are all mandatory.
+
+.TP
+.BI "-p\fR,\fB --private-key " private-key-file
+Specify signer's private key file in PEM
+
+.TP
+.BI "-c\fR,\fB --certificate " certificate-file
+Specify signer's certificate file in EFI certificate list format
+
+.TP
+.BI "-m\fR,\fB --monotonic-count " count
+Specify a monotonic count which is set to be monotonically incremented
+at every firmware update.
+
+.TP
+.B "-d\fR,\fB --dump_sig"
+Dump signature data into *.p7 file
+
+.PP
+.SH FILES
+.TP
+.I /EFI/UpdateCapsule
+The directory in which all capsule files be placed
+
+.SH SEE ALSO
+.BR mkimage (1)
+
+.SH AUTHORS
+Written by AKASHI Takahiro <takahiro.akashi@linaro.org>
+
+.SH HOMEPAGE
+http://www.denx.de/wiki/U-Boot/WebHome