diff --git a/NumLib/ODESolver/TimeLoopSingleODE.h b/NumLib/ODESolver/TimeLoopSingleODE.h
index 96900a4e3059b27efed9dd005b914dfebb10221f..4972819738bc72590bbaf1a6cfa7523125ab3181 100644
--- a/NumLib/ODESolver/TimeLoopSingleODE.h
+++ b/NumLib/ODESolver/TimeLoopSingleODE.h
@@ -103,7 +103,6 @@ loop(const double t0, const Vector x0, const double t_end, const double delta_t,
 
         time_disc.pushState(t, x, _ode_sys);
 
-        // TODO check const ref
         auto const  t_cb = t; // make sure the callback cannot overwrite anything.
         auto const& x_cb = x; // ditto.
         post_timestep(t_cb, x_cb);