diff --git a/src/ca/client/CAref.html b/src/ca/client/CAref.html
index 81e2eb664..ef4df758e 100644
--- a/src/ca/client/CAref.html
+++ b/src/ca/client/CAref.html
@@ -3137,7 +3137,8 @@ indicating the current state of the channel.</p>
 <dl>
   <dt><code>COUNT</code></dt>
     <dd>The element count to be read from the specified channel. A count of
-      zero means use the current element count from the server.</dd>
+      zero means use the current element count from the server, effectively
+      resulting in a variable size array subscription.</dd>
 </dl>
 <dl>
   <dt><code>CHID</code></dt>