diff --git a/README.md b/README.md
index 1e54195..8758f99 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,7 @@ some more practical uses would be things like:
 * add Bitsy HD and Bitsy 7.0 test data
 * fix variables/endings becoming "DLG DLG"?
 * dedupe "animation frames from string" functionality
+* handle NaN in images (convert to 0? investigate)
 
 ### tidy up