diff --git a/TODO.md b/TODO.md
index f7433c7f..c78b1a3f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -35,6 +35,7 @@ Python required to complete the task.
   the cut is not on a major direction. [==]
 
 * Add support for `all_reductions_in_one_file` to `cactus_scalars`. [==]
+* Add support for `VolumeIntegral` thorns to `cactus_scalars`. [==]
 
 * Hunt for TODOs in the codebase and implement them. [=?=]