diff --git a/README.md b/README.md
index 0006da0..3c63bbf 100644
--- a/README.md
+++ b/README.md
@@ -108,7 +108,8 @@ except that it:
     source IP is always used.
   * Doesn't track of the number of torrent downloads (0 is always sent). 
 
-Supports IPv4 and IPv6.
+Supports IPv4 and IPv6 (BitTorrent UDP protocol doesn't support IPv6 very well,
+however.)
 
 #### Benchmarks
 
diff --git a/TODO.md b/TODO.md
index f7fbba9..387929c 100644
--- a/TODO.md
+++ b/TODO.md
@@ -41,10 +41,8 @@
 ## aquatic_udp
 * mio: set oneshot for epoll and kqueue? otherwise, stop reregistering?
 * handle errors similarily to aquatic_ws, including errors in socket workers
-* Handle Ipv4 and Ipv6 peers. Probably split torrent state. Ipv4 peers
-  can't make use of Ipv6 ones. Ipv6 ones may or may note be able to make
-  use of Ipv4 ones, I have to check.
 * More tests?
+* Protocol crate: converter functions should be trait functions
 
 # Not important