diff --git a/usage.html b/usage.html
index 2989403..d81ec8c 100644
--- a/usage.html
+++ b/usage.html
@@ -55,7 +55,7 @@ <h2>Basic Usage</h2>
 <p>
 Note that all of these competition modes are really shortcuts for other combinations e.g. casc mode is a shortcut for
 <code>
-vampire --mode portflio --schedule casc -t 300s -p tptp
+vampire --mode portfolio --schedule casc -t 300s -p tptp
 </code>
 
 <h2>Options and More Advanced Usage</h2>