diff --git a/auditing.go b/auditing.go
index 6416460..0ef7c41 100644
--- a/auditing.go
+++ b/auditing.go
@@ -24,6 +24,7 @@ func reverseHashes(hashes []ct.MerkleTreeNode) {
 
 // TODO: drop the MerkleTreeBuilder return value
 func VerifyConsistencyProof(proof ct.ConsistencyProof, first *ct.SignedTreeHead, second *ct.SignedTreeHead) (bool, *MerkleTreeBuilder) {
+	// TODO: make sure every hash in proof is right length? otherwise input to hashChildren is ambiguous
 	if second.TreeSize < first.TreeSize {
 		// Can't be consistent if tree got smaller
 		return false, nil