Update Berry.md

mqtt.subscribe without active MQTT connection

docs/Berry.md

@@ -581,6 +581,7 @@ Tasmota Function|Parameters and details
 :---|:---
 mqtt.publish<a class="cmnd" id="mqtt_publish"></a>|`(topic:string, payload:string[, retain:bool, start:int, len:int]) -> nil`<br>Equivalent of `publish` command, publishes a MQTT message on `topic` with `payload`. Optional `retain` parameter.<br>`payload` can be a string or a bytes() binary array<br>`start` and `len` allow to specify a sub-part of the string or bytes buffer, useful when sending only a portion of a larger buffer.
 mqtt.subscribe<a class="cmnd" id="mqtt_subscribe"></a>|`mqtt.subscribe(topic:string [, function:closure]) -> nil`<br>Subscribes to a `topic` (exact match or pattern). Contrary to Tasmota's `Subscribe` command, the topic is sent as-is and not appended with `/#`. You need to add wildcards yourself. Driver method `mqtt_data` is called for each matching payload.<br>If a function/closure is added, the function is called whenever and only if an incoming messages matches the pattern for this function. The function should return `true` if message was processed, `false` if not which will let the message flow to Tasmota eventually as a command.
+You can call mqtt.subscribe even without MQTT connection, and Tasmota will manage subscriptions upon connection, also when reconnecting after an outage. This allows code in `autoexec.be` do make a subscription, which will then have effect after connection has been established.
 mqtt.unsubscribe<a class="cmnd" id="mqtt_unsubscribe"></a>|`(topic:string) -> nil`<br>Unubscribe to a `topic` (exact match).
 mqtt.connected<a class="cmnd" id="mqtt_connected"></a>|`mqtt.connected() -> bool`<br>Returns `true` if Tasmota is connected to the MQTT broker