diff --git a/dataflow_neuro/primitives.act b/dataflow_neuro/primitives.act
index 733bb9a..541c9d5 100644
--- a/dataflow_neuro/primitives.act
+++ b/dataflow_neuro/primitives.act
@@ -387,6 +387,9 @@ namespace tmpl {
         
         // Demux 
         export template<pint N; pbool CONDITION_SIGN>
+        // WARNING WARNING WARNING
+        // With a False CONDITION_SIGN, this is wrong.
+        // the c.t/f just need to be swapped, not inverted!!!
         defproc demux_td (avMx1of2<N> in; avMx1of2<N> out; a1of1 token; bool? reset_B; avMx1of2<1> cond; power supply) {
             //control
             bool _en, _reset_BX,_reset_BXX[N], _out_v, _in_c_v_, _reset_BXt;