diff --git a/doc/src/CNN/cnn.do.txt b/doc/src/CNN/cnn.do.txt
index 40b715e51..388f3ec22 100644
--- a/doc/src/CNN/cnn.do.txt
+++ b/doc/src/CNN/cnn.do.txt
@@ -2,6 +2,11 @@ TITLE: Convolutional Neural Networks
 AUTHOR: Morten Hjorth-Jensen {copyright, 1999-present|CC BY-NC} at Department of Physics, University of Oslo & Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University
 DATE: today
 
+!split
+===== To do list =====
+
+* add material about the mathematics, with more explanations
+* update codes to tensorflow 2
 
 
 !split