diff --git a/stdlib/2/inspect.pyi b/stdlib/2/inspect.pyi
index 8bc2eacb1..654fa0773 100644
--- a/stdlib/2/inspect.pyi
+++ b/stdlib/2/inspect.pyi
@@ -55,11 +55,11 @@ def ismemberdescriptor(object: object) -> bool: ...
 def findsource(object: object) -> Tuple[List[str], int]: ...
 def getabsfile(object: object) -> str: ...
 def getblock(lines: Sequence[str]) -> Sequence[str]: ...
-def getdoc(object: object) -> str: ...
-def getcomments(object: object) -> str: ...
+def getdoc(object: object) -> Optional[str]: ...
+def getcomments(object: object) -> Optional[str]: ...
 def getfile(object: object) -> str: ...
-def getmodule(object: object) -> ModuleType: ...
-def getsourcefile(object: object) -> str: ...
+def getmodule(object: object) -> Optional[ModuleType]: ...
+def getsourcefile(object: object) -> Optional[str]: ...
 # TODO restrict to "module, class, method, function, traceback, frame,
 # or code object"
 def getsourcelines(object: object) -> Tuple[List[str], int]: ...
diff --git a/stdlib/3/inspect.pyi b/stdlib/3/inspect.pyi
index 61737158e..320200c44 100644
--- a/stdlib/3/inspect.pyi
+++ b/stdlib/3/inspect.pyi
@@ -80,11 +80,11 @@ def ismemberdescriptor(object: object) -> bool: ...
 def findsource(object: object) -> Tuple[List[str], int]: ...
 def getabsfile(object: object) -> str: ...
 def getblock(lines: Sequence[str]) -> Sequence[str]: ...
-def getdoc(object: object) -> str: ...
-def getcomments(object: object) -> str: ...
+def getdoc(object: object) -> Optional[str]: ...
+def getcomments(object: object) -> Optional[str]: ...
 def getfile(object: object) -> str: ...
-def getmodule(object: object) -> ModuleType: ...
-def getsourcefile(object: object) -> str: ...
+def getmodule(object: object) -> Optional[ModuleType]: ...
+def getsourcefile(object: object) -> Optional[str]: ...
 # TODO restrict to "module, class, method, function, traceback, frame,
 # or code object"
 def getsourcelines(object: object) -> Tuple[List[str], int]: ...