diff --git a/build.html b/build.html
index 07685f4..c8d881f 100644
--- a/build.html
+++ b/build.html
@@ -247,6 +247,9 @@ <h2>
           <h2>
             Request runouts data with /Group and `runout`
           </h2>
+          <div class="ds-u-font-size--base">
+            Runout data is used at the beginning of the year to retrieve data from the past year.  It includes beneficiaries who were attributed to your model entity the previous year but not the current year. These claims will have a service date no later than December 31 of the previous year.
+          </div>
           <div class="ds-u-font-size--base">
             {% include build/requesting_data_runouts.html %}
           </div>