diff --git a/docs/installation/index.rst b/docs/installation/index.rst
index 56f0015b..19016ce9 100644
--- a/docs/installation/index.rst
+++ b/docs/installation/index.rst
@@ -25,6 +25,8 @@ Otherwise, make sure you got the required dependencies installed.
 
 - Python >= 2.6, < 3
 
+- `Pykka <http://jodal.github.com/pykka/>`_ >= 0.9.1
+
 - GStreamer >= 0.10, with Python bindings. See :doc:`gstreamer`.
 
 - Mixer dependencies: The default mixer does not require any additional
diff --git a/requirements/core.txt b/requirements/core.txt
new file mode 100644
index 00000000..54781a3b
--- /dev/null
+++ b/requirements/core.txt
@@ -0,0 +1 @@
+Pykka >= 0.9.1