diff --git a/deltazeus/todo.txt b/deltazeus/todo.txt
index a099036..c5155b4 100644
--- a/deltazeus/todo.txt
+++ b/deltazeus/todo.txt
@@ -1 +1,4 @@
-TBD
+- soft pwm for fans to respect sunon 40mm fans
+  - https://github.com/MarlinFirmware/Marlin/issues/12360
+  - https://github.com/MarlinFirmware/Marlin/issues/19924
+  - https://www.3d-druck-community.de/showthread.php?tid=23057
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