diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 67a82fab..098902c0 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -1023,14 +1023,17 @@ def fetchcp_new(rower,workouts):
         cpfile = 'media/cpdata_{id}.parquet.gz'.format(id=workout.id)
         try:
             df = pd.read_parquet(cpfile)
+            df['workout'] = str(workout)
             data.append(df)
         except OSError:
             # CP data file doesn't exist yet. has to be created
-            data.append(setcp(workout)[0])
+            df, delta, cpvalues = setcp(workout)
+            df['workout'] = str(workout)
+            data.append(df)
 
 
     if len(data) == 0:
-        return pd.Series(),pd.Series(),0
+        return pd.Series(),pd.Series(),0,pd.Series()
     if len(data)>1:
         df = pd.concat(data,axis=0)
 
@@ -1039,7 +1042,7 @@ def fetchcp_new(rower,workouts):
 
     df = df.sort_values(['delta']).reset_index()
 
-    return df['delta'],df['cp'],0
+    return df['delta'],df['cp'],0,df['workout']
 
 def setcp(workout):
     strokesdf = getsmallrowdata_db(['power','workoutid','time'],ids = [workout.id])
diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 3f78a6f4..a3ed138e 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -2921,13 +2921,15 @@ def interactive_otwcpchart(powerdf,promember=0,rowername="",r=None,cpfit='data')
 
     deltas = fitt.apply(lambda x: timedeltaconv(x))
     ftime = niceformat(deltas)
+    workouts = powerdf['workout']
 
     sourcecomplex = ColumnDataSource(
         data = dict(
             CP = fitpower,
             CPmax = ratio*fitpower,
             duration = fitt,
-            ftime = ftime
+            ftime = ftime,
+            workout = workouts,
             )
         )
 
@@ -2978,6 +2980,7 @@ def interactive_otwcpchart(powerdf,promember=0,rowername="",r=None,cpfit='data')
         ('Duration ','@ftime'),
         ('Power (W)','@CP{int}'),
         ('Power (W) upper','@CPmax{int}'),
+        ('Workout','@workout'),
         ])
 
     hover.mode = 'mouse'
diff --git a/rowers/views/analysisviews.py b/rowers/views/analysisviews.py
index 891f548f..95615913 100644
--- a/rowers/views/analysisviews.py
+++ b/rowers/views/analysisviews.py
@@ -521,10 +521,11 @@ def cpdata(workouts, options):
 
 
     ids = [w.id for w in workouts]
-    delta, cpvalue, avgpower = dataprep.fetchcp_new(r,workouts)
+    delta, cpvalue, avgpower,workouts = dataprep.fetchcp_new(r,workouts)
     powerdf = pd.DataFrame({
         'Delta':delta,
         'CP':cpvalue,
+        'workout':workouts,
     })