diff --git a/README.md b/README.md
index b6158ff..d0e96af 100644
--- a/README.md
+++ b/README.md
@@ -52,4 +52,5 @@ implementations of graph-theoretical algorithms and utilities in rust.
 
 - [ ] make vertex identities separate from vertex data
 - [ ] if useful, add `(V, inc(E))` representation (incidence matrix)
+- [ ] improve allocation size heuristic for queue, visited set, etc in search algos