diff --git a/index.html b/index.html
index 17663a6..2b1acef 100644
--- a/index.html
+++ b/index.html
@@ -100,7 +100,7 @@ <h2>
         <dfn data-dfn-for="digital credential">query</dfn>
       </dt>
       <dd>
-        A format that a [=verifier=] uses, via an [=digital credential/exchange
+        A format that [=verifier=] software or a [=user agent=] uses, via an [=digital credential/exchange
         protocol=], to request a [=digital credential=] from a [=holder=].
       </dd>
       <dt>