- Add missing ``funcsigs`` dependency on Python 2.
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1672271..a42de9e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,6 @@
+
+- Add missing ``funcsigs`` dependency on Python 2.
+
 3.0.1
 -----
 
diff --git a/setup.cfg b/setup.cfg
index 66d0fb2..7283b79 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,7 +29,9 @@
     testing, test, mock, mocking, unittest, patching, stubs, fakes, doubles
 
 [options]
-install_requires=six
+install_requires =
+  six
+  funcsigs>=1;python_version<"3.3"
 python_requires=>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
 packages = mock