Clarified example comment.

config/vufind/config.ini

@@ -1119,8 +1119,9 @@ url             = https://www.myendnoteweb.com/EndNoteWeb.html
 
 ;timeout = 30 ; default timeout if not overridden by more specific code/settings
 
-; Using a curl Adapter instead of the the defaultAdapter (Socket)
-; adapter = 'Zend\Http\Client\Adapter\Curl'
+; Example: Using a CURL Adapter instead of the the defaultAdapter (Socket); note
+; that you may also need to install CURL and PHP/CURL packages on your server.
+;adapter = 'Zend\Http\Client\Adapter\Curl'
 
 ; Spelling Suggestions
 ;