diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 32a596616..d417bce3b 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -295,8 +295,10 @@ class bytes(ByteString):
     def translate(self, table: bytes) -> bytes: ...
     def upper(self) -> bytes: ...
     def zfill(self, width: int) -> bytes: ...
-    # TODO fromhex
-    # TODO maketrans
+    @classmethod
+    def fromhex(cls, s: str) -> bytes: ...
+    @classmethod
+    def maketrans(cls, frm: ByteString, to: ByteString) -> bytes: ...
 
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[int]: ...
@@ -366,8 +368,10 @@ class bytearray(MutableSequence[int], ByteString):
     def translate(self, table: bytes) -> bytearray: ...
     def upper(self) -> bytearray: ...
     def zfill(self, width: int) -> bytearray: ...
-    # TODO fromhex
-    # TODO maketrans
+    @classmethod
+    def fromhex(cls, s: str) -> bytearray: ...
+    @classmethod
+    def maketrans(cls, frm: ByteString, to: ByteString) -> bytes: ...
 
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[int]: ...