diff --git a/mir_eval/chord.py b/mir_eval/chord.py
index e54a1153..3b1cdb4a 100644
--- a/mir_eval/chord.py
+++ b/mir_eval/chord.py
@@ -344,7 +344,7 @@ def reduce_extended_quality(quality):
 # which is in turn derived from the context-free grammar of
 # Harte et al., 2005.
 CHORD_RE = re.compile(
-    r"""^((N|X)|(([A-G](b*|#*))((:(maj|min|dim|aug|1|5|sus2|sus4|maj6|min6|7|maj7|min7|dim7|hdim7|minmaj7|aug7|9|maj9|min9|11|maj11|min11|13|maj13|min13)(\((\*?((b*|#*)([1-9]|1[0-3]?))(,\*?((b*|#*)([1-9]|1[0-3]?)))*)\))?)|(:\((\*?((b*|#*)([1-9]|1[0-3]?))(,\*?((b*|#*)([1-9]|1[0-3]?)))*)\)))?((/((b*|#*)([1-9]|1[0-3]?)))?)?))$"""
+    r"""^((N|X)|(([A-G](b*|#*))((:(maj|min|dim|aug|1|5|sus2|sus4|maj6|min6|7|maj7|min7|dim7|hdim7|minmaj7|aug7|9|maj9|min9|b9|#9|11|#11|maj11|min11|13|maj13|min13|b13)(\((\*?((b*|#*)([1-9]|1[0-3]?))(,\*?((b*|#*)([1-9]|1[0-3]?)))*)\))?)|(:\((\*?((b*|#*)([1-9]|1[0-3]?))(,\*?((b*|#*)([1-9]|1[0-3]?)))*)\)))?((/((b*|#*)([1-9]|1[0-3]?)))?)?))$"""
 )  # nopep8
 
 
diff --git a/tests/test_chord.py b/tests/test_chord.py
index 0e70cf97..402305de 100644
--- a/tests/test_chord.py
+++ b/tests/test_chord.py
@@ -638,3 +638,9 @@ def test_validate():
     # Test that error is thrown on different-length labels
     with pytest.raises(ValueError):
         mir_eval.chord.validate([], ["C"])
+
+# @maximoskp
+# make testing for all chord types
+# quals = mir_eval.chord.QUALITIES
+# for q in quals.keys():
+#     c = mir_eval.chord.encode('C' + (len(q) > 0)*':' + q, reduce_extended_chords=True)
\ No newline at end of file