diff --git a/docs/internals/contributing/writing-code/unit-tests.txt b/docs/internals/contributing/writing-code/unit-tests.txt
index 06310962dd..70d321ad1c 100644
--- a/docs/internals/contributing/writing-code/unit-tests.txt
+++ b/docs/internals/contributing/writing-code/unit-tests.txt
@@ -141,6 +141,7 @@ Running all the tests
 If you want to run the full suite of tests, you'll need to install a number of
 dependencies:
 
+*  numpy_
 *  PIL_
 *  py-bcrypt_
 *  PyYAML_
@@ -171,6 +172,7 @@ and install the Geospatial libraries</ref/contrib/gis/install>`.
 Each of these dependencies is optional. If you're missing any of them, the
 associated tests will be skipped.
 
+.. _numpy: https://pypi.python.org/pypi/numpy
 .. _PIL: https://pypi.python.org/pypi/PIL
 .. _py-bcrypt: https://pypi.python.org/pypi/py-bcrypt/
 .. _PyYAML: http://pyyaml.org/wiki/PyYAML
diff --git a/tests/requirements/base.txt b/tests/requirements/base.txt
index 606a8c7e2b..c89533b0df 100644
--- a/tests/requirements/base.txt
+++ b/tests/requirements/base.txt
@@ -1,5 +1,6 @@
 docutils
 Markdown
+numpy
 PIL
 py-bcrypt
 python-memcached