diff --git a/rowers/templates/agegroupchart.html b/rowers/templates/agegroupchart.html
index 2bebbe61..f3ecf8b3 100644
--- a/rowers/templates/agegroupchart.html
+++ b/rowers/templates/agegroupchart.html
@@ -39,6 +39,11 @@
 
 	<h1>Interactive Plot</h1>
 
+        <p>This chart shows the <a href="http://www.concept2.com/indoor-rowers/racing/records/world">Indoor Rower World Records</a> for your gender and
+          weight class. The red dots are the official records, and hovering
+          over them with your mouse shows you the name of the record holder.
+          The blue line is a fit to the data, which is used by rowsandall.com
+          to calculate your performance assessment.</a>
 
     {{ the_div|safe }}
 
diff --git a/rowers/templates/rankings.html b/rowers/templates/rankings.html
index a89fb97d..369827b5 100644
--- a/rowers/templates/rankings.html
+++ b/rowers/templates/rankings.html
@@ -74,7 +74,9 @@
 	<a href="/rowers/{{ id }}/ote-bests/{{ startdate|date:"Y-m-d" }}/{{ enddate|date:"Y-m-d" }}">https://rowsandall.com/rowers/{{ id }}/ote-bests/{{ startdate|date:"Y-m-d" }}/{{ enddate|date:"Y-m-d" }}</a>
 	</p>
 
-<p>The table gives the best efforts achieved on the official Concept2 ranking pieces in the selected date range.</p>
+        <p>The table gives the best efforts achieved on the
+          <a href="https://log.concept2.com/rankings">official Concept2 ranking pieces</a> in the selected date range. Also the percentile scores on the
+        chart are based on the Concept2 rankings.</p>
 
 
 </div>