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@@ -375,8 +375,9 @@ Valid options are:
Supported extensions
====================
-Performance is better for servers supporting the following extensions to
-the [IMAP4rev1 protocol][RFC 3501]:
+`interimap` takes advantage of servers supporting the following
+extensions to the [IMAP4rev1 protocol][RFC 3501] (those marked as
+“recommended” give the most significant performance gain):
* `LITERAL+` ([RFC 2088], recommended);
* `MULTIAPPEND` ([RFC 3502], recommended);