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@@ -0,0 +1,22 @@
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+DNS SRV record support in apt
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+=============================
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+
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+Apt supports a subset of the DNS SRV server records protocol as
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+described in RFC 2782 for service discovery.
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+
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+Before connecting to the requested server APT will send a SRV
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+record request of the form "_$protocol._tcp._$host", e.g.
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+"_http._tcp.ftp.debian.org" or "_http._tcp.security.debian.org".
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+
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+If the server sends SRV records
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+as a reply APT will use those to connect to the server(s) in
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+this reply. It will honor the "priority" field in the reply.
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+
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+However it does not implement the "weight" alogrithm as described
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+in RFC 2782. It will use an equal weight for each server of the
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+same priority.
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+
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+If connecting to a server fails APT will retry with the next one
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+and remove the server from the list of valid servers for this
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+session.
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+
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Michael Vogt