diff --git a/buffer/bufferer.go b/buffer/bufferer.go
new file mode 100644
index 0000000..1c34ae4
--- /dev/null
+++ b/buffer/bufferer.go
@@ -0,0 +1,7 @@
+package buffer
+
+type (
+	Bufferer interface {
+		Next() rune
+	}
+)