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-rw-r--r--doc/sms-forward.md7
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diff --git a/doc/sms-forward.md b/doc/sms-forward.md
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--- a/doc/sms-forward.md
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@@ -50,6 +50,13 @@ Notification settings are required for
Tips & Tricks
-------------
+### Take care of harmful commands!
+
+It is easy to fake the sending phone number! So make sure you do not rely on
+that number for potentially harmful commands. Add a shared secret to match
+into the text instead, for example: `reboot-53cr3t-5tr1n9` instead of just
+`reboot`.
+
### Order new volume
Most broadband providers include a volume limit for their data plans. The