diff --git a/SecurityPolicy.html b/SecurityPolicy.html
index 79dfa62..e6d8558 100644
--- a/SecurityPolicy.html
+++ b/SecurityPolicy.html
@@ -48,6 +48,7 @@ a:hover {
 <body lang="en-GB">
 
 <ul class="change">
+<li> 20100512: Some clarifying tweaks to semantics supplied by Philipp G, added Arb as a role in 9.1.1. but not as critical role. </li>
 <li> 20100511: Introduced "Board" term, tightened "approval" semantics, s/wiped/erased/, slight semantic tweaks. </li>
 <li> 20100502: Made 7.3 blank, "refer to SM" </li>
 <li> 20100424: tidied up 9.4 </li>
@@ -643,7 +644,7 @@ and hardware maintenance.
 
 <h4 id="s4.1.1">4.1.1. Privileged accounts and passphrases </h4>
 <p>
-Access to Accounts
+Access to <span class="change">privileged</span> accounts
 (root and user via SSH or console)
 must be strictly controlled.
 Passphrases and SSH private keys used for entering into the systems
@@ -1064,7 +1065,7 @@ See &sect;3.4.2.
 <p>
 Support Engineers do not have any inherent authority
 to take any action,
-and they have have to get authority on a case-by-case basis.
+and they have to get authority on a case-by-case basis.
 The authority required in each case must be guided
 by this policy or the Security Manual or other clearly
 applicable document.
@@ -1085,7 +1086,7 @@ Support Engineers have these responsibilities:
 </p>
 
 <ul><li>
-     Account Recovery, as documented in the Security Manual.
+     <span class="change">Member</span> account recovery, as documented in the Security Manual.
   </li><li>
      Respond to general requests for information or explanation by Members.
      Support Engineers cannot make a binding statement.
@@ -1142,6 +1143,7 @@ or Case Managers.
     <li> Team leaders: coordinate with teams, report to Board.</li>
     <li> All: respond to Arbitrator's rulings on changes. Respond to critical security issues. Observe.</li>
     <li> Board: authorise new individuals and accesses. Coordinate overall. </li>
+    <li class="change"> Arbitrator: conducts ABCs.  Authorises exceptions to policy. </li>
 </ul>
 
 <h4 id="s9.1.2"> 9.1.2.  Staffing levels</h4>
@@ -1200,6 +1202,7 @@ An investigation within ABC should include examination of:
 <h4 id="s9.1.4.2"> 9.1.4.2.  Coverage </h4>
 <p>
 ABC is to be done on every individual in a critical role.
+<span class="change">See &sect;1.1.1.</span>
 </p>
 
 <h4 id="s9.1.4.3"> 9.1.4.3.  Documentation </h4>
@@ -1248,7 +1251,10 @@ with the relevant supporting information as above.
 
 <p>
 The Board should deliberate directly and in full.
-Board members who are also active in the area should recuse from the vote,
+Board members who are also active in the area should 
+<span class="strike">recuse</span>
+<span class="change">abstain</span>
+from the vote,
 but should support the deliberations.
 Deliberations and decisions should be documented.
 All conflicts of interest should be examined.
