diff --git a/index.html b/index.html
index 8809554..53163b2 100644
--- a/index.html
+++ b/index.html
@@ -1445,8 +1445,10 @@ <h4>Base Proof Configuration (bbs-2023)</h4>
 
           <p>
 The required inputs to this algorithm are <em>proof options</em>
-(|options|). The <em>proof options</em> MUST contain a type identifier
-for the
+(|options|) and the
+<a data-cite="vc-data-integrity#dfn-unsecured-data-document">unsecured data
+document</a> (|unsecuredDocument|). The <em>proof options</em> MUST contain a
+type identifier for the
 <a data-cite="vc-data-integrity#dfn-cryptosuite">
 cryptographic suite</a> (|type|) and MUST contain a cryptosuite
 identifier (|cryptosuite|). A <em>proof configuration</em>