added explanation

rowers/datautils.py

@@ -468,7 +468,6 @@ def getfastest(df,thevalue,mode='distance'):
         starttime = griddata(restime,starttimes,[thevalue*60*1000],method='linear',rescale=True)
         duration = griddata(restime,restime,[thevalue*60*1000],method='linear',rescale=True)
         endtime = starttime+duration
-        print(distance,starttime,endtime    )
         return distance[0],starttime[0]/1000.,endtime[0]/1000.
 
     return 0 # pragma: no cover

rowers/templates/summary_edit.html

@@ -60,7 +60,9 @@
       </tr>
     </table>
 		<h1>Feeling lucky?</h1>
-		<p>
+		<p>This new, experimental feature tries to find intervals by looking for patterns in the data. It does not
+			autodetect rest and work intervals yet. The resulting "interval string" is copied to the Interval Shorthand
+			section below, where you can edit it.
 			<form enctype="multipart/form-data" method="post">
 				<input type="hidden" name="ruptures" value="ruptures">
 				<table width=100%>