diff --git a/include/armadillo_bits/fn_accu.hpp b/include/armadillo_bits/fn_accu.hpp
index 6a6d6369..347e9372 100644
--- a/include/armadillo_bits/fn_accu.hpp
+++ b/include/armadillo_bits/fn_accu.hpp
@@ -891,6 +891,10 @@ accu(const BaseCube<typename T1::elem_type,T1>& X)
 
 
 
+// TODO: accu(const eOpCube<T1,eop_pow>& expr)
+
+
+
 //! explicit handling of multiply-and-accumulate (cube version)
 template<typename T1, typename T2>
 arma_warn_unused