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diff --git a/doc/mkimage.1 b/doc/mkimage.1
index 6740fb1..8185ff5 100644
--- a/doc/mkimage.1
+++ b/doc/mkimage.1
@@ -109,6 +109,14 @@ Specifies the directory containing keys to use for signing. This directory
should contain a private key file <name>.key for use with signing and a
certificate <name>.crt (containing the public key) for use with verification.
+.TP
+.BI "\-K [" "key_destination" "]"
+Specifies a compiled device tree binary file (typically .dtb) to write
+public key information into. When a private key is used to sign an image,
+the corresponding public key is written into this file for for run-time
+verification. Typically the file here is the device tree binary used by
+CONFIG_OF_CONTROL in U-Boot.
+
.SH EXAMPLES
List image information:
@@ -127,6 +135,14 @@ Create FIT image with compressed PowerPC Linux kernel:
.nf
.B mkimage -f kernel.its kernel.itb
.fi
+.P
+Create FIT image with compressed kernel and sign it with keys in the
+/public/signing-keys directory. Add corresponding public keys into u-boot.dtb,
+skipping those for which keys cannot be found. Also add a comment.
+.nf
+.B mkimage -f kernel.its -k /public/signing-keys -K u-boot.dtb \\\\
+-c "Kernel 3.8 image for production devices" kernel.itb
+.fi
.SH HOMEPAGE
http://www.denx.de/wiki/U-Boot/WebHome