diff --git a/src/traits.rs b/src/traits.rs
index aa28583..ffb2cc1 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -1,5 +1,7 @@
 // TODO: Add functions to reserve memory for vertices and edges.
-// TODO: Add iterator of edges.
+// TODO: Add iterator of all edges.
+// TODO: Add iterator of incident edges for a vertex.
+// TODO: Add finding incident vertices for an edge.
 // TODO: Split out GraphTopologyAddition trait.
 pub trait GraphTopology {
     type Vertex: Copy + Eq;