diff --git a/chainntfs/btcd.go b/chainntfs/btcd.go
new file mode 100644
index 00000000..1db41fa6
--- /dev/null
+++ b/chainntfs/btcd.go
@@ -0,0 +1,8 @@
+package chainntnfs
+
+type BtcdNotifier struct {
+}
+
+func newBtcdNotifier() (*BtcdNotifier, error) {
+	return nil, nil
+}
diff --git a/chainntfs/chainntfs.go b/chainntfs/chainntfs.go
index 5e78787f..2f7a096f 100644
--- a/chainntfs/chainntfs.go
+++ b/chainntfs/chainntfs.go
@@ -7,6 +7,7 @@ package chainntnfs
 //   * direct p2p
 //   * random bitcoin API?
 //   * electrum?
+//   * SPV bloomfilter
 //   * other stuff maybe...
 type ChainNotifier interface {
 }