add conditional-create

index.bs

@@ -3982,7 +3982,8 @@ Note: The {{UserVerificationRequirement}} enumeration is deliberately not refere
         "user-verifying-platform-authenticator",
         "hybrid-transport",
         "passkey-platform-authenticator",
-        "conditional-mediation"
+        "conditional-mediation",
+        "conditional-create"
     };
 </xmp>
 
@@ -4002,6 +4003,9 @@ Note: The {{ClientCapability}} enumeration is deliberately not referenced, see [
 
     :   <dfn>conditional-mediation</dfn>
     ::  The [=WebAuthn Client=] is capable of {{CredentialMediationRequirement/conditional}} mediation.
+
+    :   <dfn>conditional-create</dfn>
+    ::  The [=WebAuthn Client=] is capable of a {{CredentialMediationRequirement/conditional}} credential creation operation.
 </div>
 
 ## Permissions Policy integration ## {#sctn-permissions-policy}