diff --git a/stix2/test/v20/test_custom.py b/stix2/test/v20/test_custom.py
index cb04c17..6d127f2 100644
--- a/stix2/test/v20/test_custom.py
+++ b/stix2/test/v20/test_custom.py
@@ -889,7 +889,7 @@ def test_parse_observable_with_custom_extension():
 def test_custom_and_spec_extension_mix():
     """
     Try to make sure that when allow_custom=True, encountering a custom
-    extension doesn't result in a partially-cleaned extensions property.
+    extension doesn't result in a completely uncleaned extensions property.
     """
 
     file_obs = stix2.v20.File(
diff --git a/stix2/test/v21/test_custom.py b/stix2/test/v21/test_custom.py
index 9ee982f..47d484a 100644
--- a/stix2/test/v21/test_custom.py
+++ b/stix2/test/v21/test_custom.py
@@ -893,7 +893,7 @@ def test_parse_observable_with_custom_extension():
 def test_custom_and_spec_extension_mix():
     """
     Try to make sure that when allow_custom=True, encountering a custom
-    extension doesn't result in a partially-cleaned extensions property.
+    extension doesn't result in a completely uncleaned extensions property.
     """
 
     file_obs = stix2.v21.File(