diff --git a/index.html b/index.html
index e7ff2a4..f803538 100644
--- a/index.html
+++ b/index.html
@@ -1715,7 +1715,7 @@ <h2>Authentication</h2>
 
             <p>
 The `authentication` [=verification relationship=] is used to specify how the
-[=controller=] is expected to be [=authenticated=], for purposes such as logging
+[=subject=] is expected to be [=authenticated=], for purposes such as logging
 into a website or engaging in any sort of challenge-response protocol. The
 processing performed following authentication is application-specific.
             </p>