1 files changed, 2 insertions, 0 deletions
diff --git a/TODO.md b/TODO.md
index 9db6b53..5b0a8c1 100644
--- a/TODO.md
+++ b/TODO.md
@@ -298,6 +298,8 @@
   * Tests should fail if they can't find their inputs, or have zero
     inputs: at present they tend to succeed by default.
 
+  * Test varying strong-sum inputs: default, short, long.
+
 * Security audit
 
   * If this code was to read differences or sums from random machines