diff --git a/TASKS.txt b/TASKS.txt
index 40ed4917..25c25ab9 100644
--- a/TASKS.txt
+++ b/TASKS.txt
@@ -96,4 +96,5 @@ docs
   - Introduction to I/O and image processing with examples
 
 * In API list, use columns to better utilise page width.
+* Fix doctests