diff --git a/plasmid/resource/jython-scripts/MP-plasmid_parents.py b/plasmid/resource/jython-scripts/MP-plasmid_parents.py
index e11952c8022f4aa920949e7291c8e3fbbdb08e5b..6df558af5c39fddb4f1628bffeee8d15c5822445 100644
--- a/plasmid/resource/jython-scripts/MP-plasmid_parents.py
+++ b/plasmid/resource/jython-scripts/MP-plasmid_parents.py
@@ -31,7 +31,7 @@ INPUT_PATTERN = """
 REL_TYPES = ('DEL', 'INT', 'MOD')
 """dictionary from relationship type shortcut to its 'character' representation"""
 REL_TYPE_CHARS = {
-    'DEL': '^', 
+    'DEL': '^', # TODO 2011-14-03, Piotr Buczek: use u'\u0394' for '∆', don't encode HTML
     'INT': '::', 
     'MOD': '_' 
 }