diff --git a/TODO.md b/TODO.md
index f9e3c35..7cb920b 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,6 +5,8 @@
 ## Medium priority
 
 * Consider replacing unmaintained indexmap-amortized with plain indexmap
+* udp: use regular indexmap for peers and possibly inline variant with few peers
+
 * Run cargo-fuzz on protocol crates
 
 * quit whole program if any thread panics