diff --git a/calibration.html b/calibration.html
index e32be60..af06292 100644
--- a/calibration.html
+++ b/calibration.html
@@ -195,7 +195,7 @@
         <a href="#" data-featherlight="img/mark.jpg"><img class="thumb" src="img/mark.jpg" /></a>
         <p>Next, we enter:</p>
         <pre>G1 E100 F100</pre>
-        <p><a href="https://marlinfw.org/docs/gcode/G000-G001.html" target="_blank">G1</a> sends a move command to the printer, in this case asking the extruder to advance 100mm at a speed of 100mm/sec.</p>
+        <p><a href="https://marlinfw.org/docs/gcode/G000-G001.html" target="_blank">G1</a> sends a move command to the printer, in this case asking the extruder to advance 100mm at a speed of 100mm/min.</p>
         <p>The filament will then slowly go through the extruder and hot end. Once the extrusion finishes, we measure the distance between the mark and the entry to the extruder.</p>
         <img src="img/mark2.jpg" />
         <p>Ideally, 20mm remains, which means exactly 100mm was extruded. If your distance is anything other that this, complete the form below to calculate the correct E-steps:</p>