diff --git a/offlineimap.conf b/offlineimap.conf
index 987b6b4..869ac96 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -171,13 +171,17 @@ remoterepository = RemoteExample
 
 # autorefresh = 5
 
-# You can tell offlineimap to do a number of quicker synchronizations
-# between full updates.  A quick synchronization only synchronizes
-# if a Maildir folder has changed, or if an IMAP folder has received
-# new messages or had messages deleted.  It does not update if the
-# only changes were to IMAP flags.  Specify 0 to never do quick updates,
-# -1 to always do quick updates, or a positive integer to do that many
-# quick updates between each full synchronization (requires autorefresh).
+# OfflineImap can replace a number of full updates by quick
+# synchronizations.  It only synchronizes a folder if 1) a Maildir
+# folder has changed, or 2) if an IMAP folder has received new messages
+# or had messages deleted, ie it does not update if only IMAP flags have
+# changed.  Full updates need to fetch ALL flags for all messages, so
+# this makes quite a performance difference (especially if syncing
+# between two IMAP servers).
+# Specify 0 for never, -1 for always (works even in non-autorefresh
+# mode), or a positive integer <n> to do <n> quick updates before doing
+# another full synchronization (requires autorefresh).  Updates are
+# always performed after <autorefresh> minutes, be they quick or full.
 
 # quick = 10