diff --git a/packages/CLPBN/horus/TODO b/packages/CLPBN/horus/TODO
index 9f2dfa108..c2afafb0b 100644
--- a/packages/CLPBN/horus/TODO
+++ b/packages/CLPBN/horus/TODO
@@ -1,3 +1,4 @@
+- Handle formulas like f(X,X)
 - Find a way to decrease the time required to find an
   elimination order for variable elimination