diff --git a/tests/stubtest_allowlists/py310.txt b/tests/stubtest_allowlists/py310.txt
index 08cd87aa6..d2a7131e5 100644
--- a/tests/stubtest_allowlists/py310.txt
+++ b/tests/stubtest_allowlists/py310.txt
@@ -72,7 +72,7 @@ ssl.RAND_egd  # Depends on openssl compilation
 symtable.SymbolTable.has_exec
 sys.UnraisableHookArgs  # Not exported from sys
 types.ClassMethodDescriptorType.__get__
-types.CodeType.replace
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime
 types.GenericAlias.__getattr__
 types.MethodDescriptorType.__get__
 types.WrapperDescriptorType.__get__
diff --git a/tests/stubtest_allowlists/py38.txt b/tests/stubtest_allowlists/py38.txt
index 5188b0510..c39e36660 100644
--- a/tests/stubtest_allowlists/py38.txt
+++ b/tests/stubtest_allowlists/py38.txt
@@ -57,7 +57,7 @@ ssl.PROTOCOL_SSLv3  # Depends on ssl compilation
 ssl.RAND_egd  # Depends on openssl compilation
 sys.UnraisableHookArgs  # Not exported from sys
 types.ClassMethodDescriptorType.__get__
-types.CodeType.replace
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime
 types.MethodDescriptorType.__get__
 types.WrapperDescriptorType.__get__
 typing.NamedTuple.__new__
diff --git a/tests/stubtest_allowlists/py39.txt b/tests/stubtest_allowlists/py39.txt
index 80df8d088..6702acad1 100644
--- a/tests/stubtest_allowlists/py39.txt
+++ b/tests/stubtest_allowlists/py39.txt
@@ -63,7 +63,7 @@ ssl.RAND_egd  # Depends on openssl compilation
 symtable.SymbolTable.has_exec
 sys.UnraisableHookArgs  # Not exported from sys
 types.ClassMethodDescriptorType.__get__
-types.CodeType.replace
+types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime
 types.GenericAlias.__getattr__
 types.MethodDescriptorType.__get__
 types.WrapperDescriptorType.__get__