diff --git a/xfel_calibrate/calibrate.py b/xfel_calibrate/calibrate.py
index 9f594817e62affd8dd124a1a0bc6cb81795c484c..c8d9d859ebe093afa6fb011f7cd944abc0906366 100755
--- a/xfel_calibrate/calibrate.py
+++ b/xfel_calibrate/calibrate.py
@@ -407,6 +407,7 @@ def concurrent_run(temp_path, nb, nbname, args, cparm=None, cval=None,
     parms = extract_parameters(nb)
     params = parameter_values(parms, **args)
     new_nb = replace_definitions(nb, params, execute=False)
+    first_markdown_cell(new_nb).source = ''
     set_figure_format(new_nb, args["vector_figs"])
     base_name = nbname.replace(".ipynb", "")
     new_name = "{}__{}__{}.ipynb".format(