diff --git a/libraries/base/common/python/try_round_weight.py b/libraries/base/common/python/try_round_weight.py
index 32809f3afc2613d74f79fbc6671b89f050218ffa..24715832be19db892977b4153dea8baeb68359cd 100644
--- a/libraries/base/common/python/try_round_weight.py
+++ b/libraries/base/common/python/try_round_weight.py
@@ -59,7 +59,7 @@ import textwrap
 
 import numpy as np
 import matplotlib
-matplotlib.use('tkagg')
+matplotlib.use('tkagg')  # to make X11 forwarding work
 import matplotlib.pyplot as plt
 
 import common as cm