diff --git a/README.md b/README.md
index e3a0805..fd95784 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ MailCatcher runs a super simple SMTP server which catches any message sent to it
 * Lists attachments and allows separate downloading of parts.
 * Download original email to view in your native mail client(s).
 * Command line options to override the default SMTP/HTTP IP and port settings.
-* Mail appears instantly if your browser supports [WebSockets][websockets].
+* Mail appears instantly if your browser supports [WebSockets][websockets], otherwise updates every thirty seconds.
 * Runs as a daemon run in the background.
 * Sendmail-analogue command, `catchmail`, makes [using mailcatcher from PHP][withphp] a lot easier.
 * Written super-simply in EventMachine, easy to dig in and change.