diff --git a/nodes/core/io/10-mqtt.html b/nodes/core/io/10-mqtt.html
index 722a7a7ae..afe710472 100644
--- a/nodes/core/io/10-mqtt.html
+++ b/nodes/core/io/10-mqtt.html
@@ -41,7 +41,7 @@
        <dt>payload <span class="property-type">string | buffer</span></dt>
        <dd>a string unless detected as a binary buffer.</dd>
        <dt>topic <span class="property-type">string</span></dt>
-       <dd>the MQTT topic, uses / as a heirarchy separator.</dd>
+       <dd>the MQTT topic, uses / as a hierarchy separator.</dd>
        <dt>qos <span class="property-type">number</span> </dt>
        <dd>0, fire and forget - 1, at least once - 2, once and once only.</dd>
        <dt>retain <span class="property-type">boolean</span></dt>