diff --git a/calibration.html b/calibration.html
index 414e056..783ad08 100644
--- a/calibration.html
+++ b/calibration.html
@@ -122,7 +122,7 @@
         <pre>M303 E-1 S60 U1</pre>
         <p>The bed is selected with <ib>E-1</b>, and the temp set to 60 degrees. Substitute as necessary for your normal printing bed temperature. Once again save to EEPROM afterwards with:</p>
         <pre>M500</pre>
-        <p>It may be preferable to have the printer as close to printing conditions as possible during these tuning procedures. That means having filament loaded and the part cooling fan on for PLA temperatures.</p>
+        <p>It may be preferable to have the printer as close to printing conditions as possible during these tuning procedures. That means having filament loaded and the part cooling fan on for PLA temperatures. If there is no UI button available to turn on the part cooling fan, you can do it manually via gcode with <b>M106 S255</b>.</p>
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