flesh out comment.

jenkins/test.sh

@@ -28,7 +28,8 @@ export PYTHONIOENCODING=UTF-8
 
 GIT_BRANCH=${GIT_BRANCH/HEAD/master}
 
-# Temporary workaround for pip/numpy bug.
+# Temporary workaround for pip/numpy bug. (Jenkin's is unable to pip install numpy successfully, scipy fails to install afterwards.
+# We tried pip 1.1, 1.2, all sorts of varieties but it's apparently a pip bug of some kind.
 wget -O /tmp/numpy.tar.gz http://pypi.python.org/packages/source/n/numpy/numpy-1.6.2.tar.gz#md5=95ed6c9dcc94af1fc1642ea2a33c1bba
 tar -zxvf /tmp/numpy.tar.gz -C /tmp/
 python /tmp/numpy-1.6.2/setup.py install