add comment describing how the ASN.1 sequence in a test is invalid
diff --git a/tests/hazmat/primitives/test_asym_utils.py b/tests/hazmat/primitives/test_asym_utils.py
index 640b5b3..1a945f3 100644
--- a/tests/hazmat/primitives/test_asym_utils.py
+++ b/tests/hazmat/primitives/test_asym_utils.py
@@ -43,4 +43,6 @@
def test_decode_rfc6979_invalid_asn1():
with pytest.raises(ValueError):
+ # This byte sequence has an invalid ASN.1 sequence length as well as
+ # an invalid integer length for the second integer.
decode_rfc6979_signature(b"0\x07\x02\x01\x01\x02\x02\x01")