diff --git a/src/ca/CAref.html b/src/ca/CAref.html
index 2c52788d8..fc912a858 100644
--- a/src/ca/CAref.html
+++ b/src/ca/CAref.html
@@ -2265,8 +2265,8 @@ least&nbsp;one update indicating the current state of the channel.</p>
 <dl>
   <dt><code>MASK</code></dt>
     <dd>A mask with bits set for each of the event trigger types requested.
-      The event trigger mask must be a logical or of one or more of the
-      following constants.
+      The event trigger mask must be a <em>bitwise or</em> of one or more of
+      the following constants.
       <ul>
         <li>DBE_VALUE - Trigger events when the channel value exceeds the
           monitor dead band</li>