diff --git a/compiler/pash_runtime.sh b/compiler/pash_runtime.sh
index 45f008ee3..e3699ecde 100755
--- a/compiler/pash_runtime.sh
+++ b/compiler/pash_runtime.sh
@@ -141,6 +141,8 @@ else
         pash_redir_output echo "$$: (5) BaSh script exited with ec: $pash_runtime_final_status"
     else 
         function run_parallel() {
+            # ideally we'd call inform_daemon_exit with the EXIT handler,
+            # but it isn't called on Ubuntu 20.04 (for no clear reason)
             trap inform_daemon_exit SIGTERM SIGINT
             export SCRIPT_TO_EXECUTE="$pash_script_to_execute"
             source "$RUNTIME_DIR/pash_restore_state_and_execute.sh"