ask to spread the word about survey

content/index.txt

 Quantum transport simulations made easy
 =======================================
 
-**Update 2 June 2015**: Please fill out the `Kwant user survey </2015-survey>`_.  Thank you for your feedback!
+**Update 2 June 2015**: Please fill out the `Kwant user survey </2015-survey>`_ and ask other Kwant users you know to do so.  Thank you for your feedback!
 
 Kwant is a `free (open source) <http://git.kwant-project.org/kwant>`_ Python
 package for numerical calculations on tight-binding models with a strong focus