add doc/unattended-lte-firmware-upgrade.md

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diff --git a/doc/unattended-lte-firmware-upgrade.md b/doc/unattended-lte-firmware-upgrade.md
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+Install LTE firmware upgrade
+============================
+
+[◀ Go back to main README](../README.md)
+
+Description
+-----------
+
+This script upgrades LTE firmware on compatible devices:
+
+* R11e-LTE
+* R11e-LTE-US
+* R11e-4G
+* R11e-LTE6
+
+A temporary scheduler is created to be independent from terminal. Thus
+starting the upgrade process over the broadband connection is supported.
+
+Requirements and installation
+-----------------------------
+
+Just install the script:
+
+    $ScriptInstallUpdate unattended-lte-firmware-upgrade;
+
+Usage and invocation
+--------------------
+
+Run the script if an upgrade for your LTE hardware is available:
+
+    / system script run unattended-lte-firmware-upgrade;
+
+Then be patient, go for a coffee and wait for the upgrade process to finish.
+
+See also
+--------
+
+* [Notify on LTE firmware upgrade](check-lte-firmware-upgrade.md)
+
+---
+[◀ Go back to main README](../README.md)  
+[▲ Go back to top](#top)
diff --git a/unattended-lte-firmware-upgrade b/unattended-lte-firmware-upgrade
index a0b297e..e54c9fb 100644
--- a/unattended-lte-firmware-upgrade
+++ b/unattended-lte-firmware-upgrade
@@ -3,6 +3,7 @@
 # Copyright (c) 2018-2020 Christian Hesse <mail@eworm.de>
 #
 # schedule unattended lte firmware upgrade
+# https://git.eworm.de/cgit/routeros-scripts/about/doc/unattended-lte-firmware-upgrade.md
 
 :foreach Interface in=[ / interface lte find ] do={
   :local Firmware;