diff --git a/pdf2book.py b/pdf2book.py
index 6e9d2d0..d21ade8 100755
--- a/pdf2book.py
+++ b/pdf2book.py
@@ -120,6 +120,19 @@ def make_zine(reader, lst):
 #  -------------------------
 #  | 10  | 11  | 12  | 13  |
 #  -------------------------
+#
+# todo 
+# - [ ] alternative folding 1 for zine
+#  _____________________
+#  | 3r | 2r | 1r | 8r |
+#  ---------------------
+#  | 4  | 5  | 6  | 7  |
+#  ---------------------
+#  _________________________
+#  | 11r | 10r |  9r | 16r |
+#  -------------------------
+#  | 12  | 13  | 14  | 15  |
+#  -------------------------
 #
     page_order=[
             2, 3, 4, 5,