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diff --git a/README b/README
index 962755e..4d6f4e5 100644
--- a/README
+++ b/README
@@ -194,7 +194,7 @@ Defines:
   udp (closure => comm closure)
 
 udp: dict argument
-  address (string): IP address to listen and send on
+  address (string list): IPv6 or IPv4 addresses to listen and send on
   port (integer): UDP port to listen and send on
   buffer (buffer closure): buffer for incoming packets
   authbind (string): optional, path to authbind-helper program
@@ -272,7 +272,8 @@ site: dict argument
   resolver (resolver closure)
   random (randomsrc closure)
   local-key (rsaprivkey closure)
-  address (string): optional, DNS name used to find our peer
+  address (string list): optional, DNS name(s) used to find our peer;
+    address literals are supported too if enclosed in `[' `]'.
   port (integer): mandatory if 'address' is specified: the port used
     to contact our peer
   key (rsapubkey closure): our peer's public key
@@ -318,10 +319,11 @@ site: dict argument
     address may suddenly change couldn't communicate reliably because
     their contact addresses might both change at once. [false]
   mobile-peers-max (integer): Maximum number of peer port/addr pairs we
-    remember and send to.  Must be at least 1 and no more than 5.  [3]
+    remember and send to.  Must be at least 1 and no more than 5.
+    [4 if any address is configured, otherwise 3]
   static-peers-max (integer): Maximum number of peer port/addr pairs
     we can try for a static site.  Must be at least 1 and no more
-    than 5.  [3]
+    than 5.  [4 or 3, as above]
   mobile-peer-expiry (integer): For "mobile" peers only, the length
     of time (in seconds) for which we will keep sending to multiple
     address/ports from which we have not seen incoming traffic. [120]