Updates to README

README.md

@@ -14,7 +14,8 @@ Currently CoreDNS is able to:
 * Retrieve zone data from primaries, i.e. act as a secondary server.
 * Loadbalancing of responses.
 * Allow for zone transfers, i.e. act as a primary server.
-* Use etcd as a backend, i.e. a 94.5% replacement for
+* Caching
+* Use etcd as a backend, i.e. a 98.5% replacement for
   [SkyDNS](https://github.com/skynetservices/skydns).
 * Serve as a proxy to forward queries to some other (recursive) nameserver.
 * Rewrite queries (both qtype, qclass and qname).

middleware/cache/README.md

@@ -20,10 +20,19 @@ A cache mostly makes sense with a middleware that is potentially slow, i.e. a pr
 answer, or to minimize backend queries for middleware like etcd. Using a cache with the file
 middleware essentially doubles the memory load with no concealable increase of query speed.
 
+The minimum TTL allowed on resource records is 5 seconds.
+
 ## Examples
 
 ~~~
-cache
+cache 10
+~~~
+
+Enable caching for all zones, but cap everything to a TTL of 10 seconds.
+
+~~~
+proxy . 8.8.8.8:53
+cache miek.nl
 ~~~
 
-Enable caching for all zones.
+Proxy to Google Public DNS and only cache responses for miek.nl (or below).