diff --git a/CHANGES/280.feature b/CHANGES/280.feature
new file mode 100644
index 00000000..14141fe8
--- /dev/null
+++ b/CHANGES/280.feature
@@ -0,0 +1 @@
+Added type hints support.
diff --git a/Makefile b/Makefile
index 838eb2fb..f17cc99a 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ setup: .develop
 .PHONY: lint
 lint:
 	pre-commit run --all-files
-	# mypy aiojobs tests
+	mypy .
 
 
 .PHONY: test
diff --git a/aiojobs/_scheduler.py b/aiojobs/_scheduler.py
index 28954c82..f5f8df93 100644
--- a/aiojobs/_scheduler.py
+++ b/aiojobs/_scheduler.py
@@ -1,20 +1,11 @@
 import asyncio
 import sys
+from collections.abc import Collection
 
 from ._job import Job
 
-try:
-    from collections.abc import Collection
-except ImportError:  # pragma: no cover
-    # Python 3.5 has no Collection ABC class
-    from collections.abc import Container, Iterable, Sized
 
-    bases = Sized, Iterable, Container
-else:  # pragma: no cover
-    bases = (Collection,)
-
-
-class Scheduler(*bases):
+class Scheduler(Collection):
     def __init__(self, *, close_timeout, limit, pending_limit, exception_handler):
         if sys.version_info >= (3, 7):
             self._loop = loop = asyncio.get_running_loop()
diff --git a/aiojobs/py.typed b/aiojobs/py.typed
new file mode 100644
index 00000000..dcf2c804
--- /dev/null
+++ b/aiojobs/py.typed
@@ -0,0 +1 @@
+# Placeholder
diff --git a/docs/conf.py b/docs/conf.py
index 16e535a2..fccd79a5 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -23,14 +23,16 @@
 import codecs
 import os
 import re
+from typing import Dict
 
 _docs_path = os.path.dirname(__file__)
 _version_path = os.path.abspath(
     os.path.join(_docs_path, "..", "aiojobs", "__init__.py")
 )
+_version_info = None
 with codecs.open(_version_path, "r", "latin1") as fp:
     try:
-        _version_info = re.search(
+        match = re.search(
             r'^__version__ = "'
             r"(?P<major>\d+)"
             r"\.(?P<minor>\d+)"
@@ -38,9 +40,14 @@
             r'(?P<tag>.*)?"$',
             fp.read(),
             re.M,
-        ).groupdict()
+        )
+        if match is not None:
+            _version_info = match.groupdict()
     except IndexError:
-        raise RuntimeError("Unable to determine version.")
+        pass
+
+if _version_info is None:
+    raise RuntimeError("Unable to determine version.")
 
 
 # -- General configuration ------------------------------------------------
@@ -163,7 +170,7 @@
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
+latex_elements: Dict[str, str] = {
     # The paper size ('letterpaper' or 'a4paper').
     #
     # 'papersize': 'letterpaper',