diff --git a/cursor/helper.go b/cursor/helper.go
deleted file mode 100644
index 80b87b9..0000000
--- a/cursor/helper.go
+++ /dev/null
@@ -1,26 +0,0 @@
-// SPDX-License-Identifier: Unlicense
-
-package cursor
-
-import (
-	"io"
-)
-
-// BufferedReaderAt uses a buffer to supplement an io.Reader
-// with limited backward seeking.
-type BufferedReaderAt struct{}
-
-func NewBufferedReaderAt(r io.Reader, minBuffer uint64) *BufferedReaderAt {
-	return nil
-}
-
-// ReadAt reads bytes from the underlying reader. If the offset is after
-// the end of the buffer, ReadAt will first read and ignore bytes from the
-// underlying reader until it reaches the offset. If the offset is
-// before the start of the buffer, ReadAt will return an error.
-//
-// If your parser needs unlimited lookahead, you should probably
-// just read the whole input into a slice and use BytesCursor.
-func (b *BufferedReaderAt) ReadAt(dst []byte, offset int64) (int, error) {
-	return 0, nil
-}
diff --git a/cursor/helper_test.go b/cursor/helper_test.go
deleted file mode 100644
index 3a32af6..0000000
--- a/cursor/helper_test.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// SPDX-License-Identifier: Unlicense
-
-package cursor_test
-
-import "testing"
-
-func TestBufferedReader(t *testing.T) {
-	Todo(t)
-}