diff --git a/examples/piechartdrilldown/main.cpp b/examples/piechartdrilldown/main.cpp
index a48af78..8aa96e7 100644
--- a/examples/piechartdrilldown/main.cpp
+++ b/examples/piechartdrilldown/main.cpp
@@ -60,7 +60,7 @@ int main(int argc, char *argv[])
 
         QObject::connect(series, SIGNAL(clicked(QPieSlice*, Qt::MouseButtons)), chart, SLOT(handleSliceClicked(QPieSlice*)));
 
-        *yearSeries << new DrilldownSlice(series->total(), name, series);
+        *yearSeries << new DrilldownSlice(series->sum(), name, series);
     }
 
     QObject::connect(yearSeries, SIGNAL(clicked(QPieSlice*, Qt::MouseButtons)), chart, SLOT(handleSliceClicked(QPieSlice*)));
diff --git a/src/piechart/qpieseries.cpp b/src/piechart/qpieseries.cpp
index b99950b..29551a4 100644
--- a/src/piechart/qpieseries.cpp
+++ b/src/piechart/qpieseries.cpp
@@ -380,10 +380,10 @@ void QPieSeries::setLabelsVisible(bool visible)
 
     \sa QPieSlice::value(), QPieSlice::setValue()
 */
-qreal QPieSeries::total() const
+qreal QPieSeries::sum() const
 {
     Q_D(const QPieSeries);
-    return d->m_total;
+    return d->m_sum;
 }
 
 /*!
@@ -520,7 +520,7 @@ QPieSeriesPrivate::QPieSeriesPrivate(QPieSeries *parent)
     m_pieRelativeSize(0.7),
     m_pieStartAngle(0),
     m_pieEndAngle(360),
-    m_total(0),
+    m_sum(0),
     m_mapValues(0),
     m_mapLabels(0),
     m_mapOrientation(Qt::Horizontal)
@@ -535,18 +535,18 @@ QPieSeriesPrivate::~QPieSeriesPrivate()
 
 void QPieSeriesPrivate::updateDerivativeData()
 {
-    m_total = 0;
+    m_sum = 0;
 
     // nothing to do?
     if (m_slices.count() == 0)
         return;
 
-    // calculate total
+    // calculate sum of all slices
     foreach (QPieSlice* s, m_slices)
-        m_total += s->value();
+        m_sum += s->value();
 
     // nothing to show..
-    if (qFuzzyIsNull(m_total))
+    if (qFuzzyIsNull(m_sum))
         return;
 
     // update slice attributes
@@ -556,7 +556,7 @@ void QPieSeriesPrivate::updateDerivativeData()
     foreach (QPieSlice* s, m_slices) {
 
         PieSliceData data = PieSliceData::data(s);
-        data.m_percentage = s->value() / m_total;
+        data.m_percentage = s->value() / m_sum;
         data.m_angleSpan = pieSpan * data.m_percentage;
         data.m_startAngle = sliceAngle;
         sliceAngle += data.m_angleSpan;
diff --git a/src/piechart/qpieseries.h b/src/piechart/qpieseries.h
index 62c6d93..3d95193 100644
--- a/src/piechart/qpieseries.h
+++ b/src/piechart/qpieseries.h
@@ -59,7 +59,7 @@ public:
     // calculated data
     int count() const;
     bool isEmpty() const;
-    qreal total() const;
+    qreal sum() const;
 
     // pie customization
     void setHorizontalPosition(qreal relativePosition);
diff --git a/src/piechart/qpieseries_p.h b/src/piechart/qpieseries_p.h
index eb20108..66fc53d 100644
--- a/src/piechart/qpieseries_p.h
+++ b/src/piechart/qpieseries_p.h
@@ -55,7 +55,7 @@ public:
     qreal m_pieRelativeSize;
     qreal m_pieStartAngle;
     qreal m_pieEndAngle;
-    qreal m_total;
+    qreal m_sum;
 
     // model map
     int m_mapValues;