diff --git a/libwebsockets-api-doc.html b/libwebsockets-api-doc.html
index a82383b..d3c83d7 100644
--- a/libwebsockets-api-doc.html
+++ b/libwebsockets-api-doc.html
@@ -765,13 +765,21 @@
 extension a chance to initialize its connection context found
 in <tt><b>user</b></tt>.
 </blockquote>
+<h3>LWS_EXT_CALLBACK_CLIENT_CONSTRUCT</h3>
+<blockquote>
+same as LWS_EXT_CALLBACK_CONSTRUCT
+but called when client is instantiating this extension.  Some
+extensions will work the same on client and server side and then
+you can just merge handlers for both CONSTRUCTS.
+</blockquote>
 <h3>LWS_EXT_CALLBACK_DESTROY</h3>
 <blockquote>
 called when the connection the extension was
 being used on is about to be closed and deallocated.  It's the
 last chance for the extension to deallocate anything it has
 allocated in the user data (pointed to by <tt><b>user</b></tt>) before the
-user data is deleted.
+user data is deleted.  This same callback is used whether you
+are in client or server instantiation context.
 </blockquote>
 <h3>LWS_EXT_CALLBACK_PACKET_RX_PREPARSE</h3>
 <blockquote>