diff --git a/troubleshooting.html b/troubleshooting.html
index d7a88c5..a75424a 100644
--- a/troubleshooting.html
+++ b/troubleshooting.html
@@ -418,7 +418,7 @@ Standard Deviation: 0.002795</pre>
         <a href="#" data-featherlight="img/m43_5.jpg"><img class="thumb" src="img/m43_5.jpg" /></a>
         <p><b>M43 P[pin] W</b> will begin watching a specific pin for activity. I couldn't find a way to exit this watching state without resetting the printer.</p>
         <a href="#" data-featherlight="img/m43_6.jpg"><img class="thumb" src="img/m43_6.jpg" /></a>
-        <m4>M43 T - Trigger pins</m4>
+        <h4>M43 T - Trigger pins</h4>
         <p><a href="https://marlinfw.org/docs/gcode/M043-T.html" target="_blank"><b>M43 T</b></a> offers a way to manually control pins with gcode.</p>
         <p>Sending <b>M43 T</b> is a variant of <b>M43</b> that allows you to cycle through your mainboard pins, pulsing them for a specific amount of time. I have not tested this personally, but the example linked on the Marlin reference page should illustrate it's use.</p>
         <h4>M42 - Set Pin State</h4>