diff --git a/source/components/switch.mqtt.markdown b/source/components/switch.mqtt.markdown
index 4b0d76b594c..74d1a2e67d9 100644
--- a/source/components/switch.mqtt.markdown
+++ b/source/components/switch.mqtt.markdown
@@ -44,3 +44,7 @@ switch:
 - **payload_on**: The payload that represents enabled state. Default is "ON". *Optional*
 - **payload_off**: The payload that represents disabled state. Default is "OFF". *Optional*
 - **optimistic**: Flag that defines if switch works in optimistic mode. Default is true if no state topic defined, else false. *Optional*
+
+<p class='note warning'>
+Make sure that your topics match exact. <code>some-topic/</code> and <code>some-topic</code> are different topics.
+</p>
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