improve ceremony dfn, add Angelo to ACKs

index.bs

@@ -244,10 +244,11 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "S
 
 : <dfn>Ceremony</dfn>
 :: The concept of a [=ceremony=] [[Ceremony]] is an extension of the concept of a network protocol, with human nodes alongside
-    computer nodes and with communication links that include UI, human-to-human communication and transfers of physical objects
-    that carry data. What is out-of-band to a protocol is in-band to a ceremony. In this specification, <a>Registration</a>,
-    <a>Authentication</a>, and <a>authorization gesture</a> are ceremonies.
-
+    computer nodes and with communication links that include user interface(s), human-to-human communication, and transfers of
+    physical objects that carry data. What is out-of-band to a protocol is in-band to a ceremony. In this specification,
+    <a>Registration</a> and <a>Authentication</a> are ceremonies, and an <a>authorization gesture</a> is often a component of
+    those [=ceremonies=].
+
 : <dfn>Client</dfn>
 :: See <a>Conforming User Agent</a>.
 
@@ -2798,7 +2799,7 @@ handled on the server side and do not need support from the API specified here.
 
 # Acknowledgements # {#acknowledgements}
 We thank the following for their contributions to, and thorough review of, this specification: Domenic Denicola, Rahul Ghosh,
-Brad Hill, Jing Jin, Anne van Kesteren, Giridhar Mandyam, Axel Nennker, Yaron Sheffer, Mike West, Boris Zbarsky.
+Brad Hill, Jing Jin, Angelo Liao, Anne van Kesteren, Giridhar Mandyam, Axel Nennker, Yaron Sheffer, Mike West, Boris Zbarsky.
 
 <pre class=biblio>
 {