Merge pull request #178 from zhx828/1.13

Update usage terms

Author: zhx828

app/views/license.html

@@ -38,7 +38,7 @@ <h2>Usage Terms</h2>
                                 <span class="highlight">or</span>
                             </li>
                             <li>you are aggregating the Content with other data of similar nature for the purposes of
-                                advancing cancer research.
+                                advancing cancer research. You must credit the source and reference these usage terms.
                             </li>
                         </ul>
                     </li>