diff --git a/python/examples/gui.py b/python/examples/gui.py
index 4fa3c36d47..9e1f8df4a9 100755
--- a/python/examples/gui.py
+++ b/python/examples/gui.py
@@ -7,6 +7,9 @@
 #          in.lammps = LAMMPS input script
 #          Nfreq = query GUI every this many steps
 
+# IMPORTANT: this script cannot yet be run in parallel via Pypar,
+#            because I can't seem to do a MPI-style broadcast in Pypar
+
 import sys,time
 
 # methods called by GUI
diff --git a/python/examples/vizplotgui.py b/python/examples/vizplotgui.py
index eb436e3cb7..ea2d004f21 100755
--- a/python/examples/vizplotgui.py
+++ b/python/examples/vizplotgui.py
@@ -9,6 +9,9 @@
 #          compute-ID = ID of compute that calculates temperature
 #                       (or any other scalar quantity)
 
+# IMPORTANT: this script cannot yet be run in parallel via Pypar,
+#            because I can't seem to do a MPI-style broadcast in Pypar
+
 import sys,time
 sys.path.append("./pizza")