diff --git a/index.html b/index.html
index d20497bbe80e65247b48643df81868c83c2d5faa..62115fbfc8504990dc9e45b9ec4e99270356bb49 100644
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+++ b/index.html
@@ -35,7 +35,7 @@ text {
 
 
 <h2>GPIO</h2>
-<p>To measure speed across a GPIO layer, we use a logic level as out token.</p>
+<p>To measure speed across a GPIO layer, we use a logic level as our token.  We also enforce that the token must reach the CPU, where code is running, rather than simply be inverted by digital logic or an event system.</p>
 
 <div id='gpio'></div>