diff --git a/src/graphs2d/qabstractseries.cpp b/src/graphs2d/qabstractseries.cpp
index cd261395..ed209fe1 100644
--- a/src/graphs2d/qabstractseries.cpp
+++ b/src/graphs2d/qabstractseries.cpp
@@ -545,6 +545,7 @@ void QAbstractSeries::setZValue(int newDrawOrder)
 }
 
 /*!
+    \internal
     Returns the graph that the series belongs to.
 
     Set automatically when the series is added to the graph,