diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 4cbc5518..6f5a9d6d 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -6843,6 +6843,7 @@ def interactive_zoneschart(rower,data,startdate,enddate,trainingzones='hr',date_
 
 
     df = pd.DataFrame(data)
+    df2 = pd.DataFrame(data)
 
     df.drop('minutes',inplace=True,axis='columns')
 
@@ -6911,6 +6912,19 @@ def interactive_zoneschart(rower,data,startdate,enddate,trainingzones='hr',date_
     p.y_range.start = 0
     p.sizing_mode = 'stretch_both'
 
+    if yaxis == 'percentage':
+        tidy_df = df2.groupby(['date']).sum()
+
+        source2 = ColumnDataSource(tidy_df)
+        y2rangemax = tidy_df.loc[:,'hours'].max()*1.1
+        p.extra_y_ranges["yax2"] = Range1d(start=0,end=y2rangemax)
+        p.line('date','hours',source=source2,y_range_name="yax2",color="black",width=5)
+        p.circle('date','hours',source=source2,y_range_name="yax2",color="black",size=10,
+                 legend_label='Hours')
+        p.add_layout(LinearAxis(y_range_name="yax2",
+                                axis_label='Hours'),'right')
+
+
     script,div = components(p)
 
     return script,div