Explain which scores are shown

pyc/templates/lab.html

@@ -19,6 +19,10 @@ Lab {{ lab.id }} due {{ lab.due }} at 11:59:59 PDT (UTC-7):
 {% endfor %}
 </table>
 
+<p>
+Users' highest scores and earliest time with that score are displayed.
+</p>
+
 <p>
 <a href="/submit/{{ lab.id }}/">Submit</a> your solution
 </p>