diff --git a/docs/doxygen/images/drawing-spline.png b/docs/doxygen/images/drawing-spline.png
new file mode 100644
index 0000000000..4f1bafc870
Binary files /dev/null and b/docs/doxygen/images/drawing-spline.png differ
diff --git a/interface/wx/dc.h b/interface/wx/dc.h
index 36482c7f5d..0af532697b 100644
--- a/interface/wx/dc.h
+++ b/interface/wx/dc.h
@@ -716,9 +716,14 @@ public:
 
         The number of points must be at least 2 for the spline to be drawn.
 
+        @note Drawn curve is not an interpolating curve - it does not go
+        through all points. It may be considered a smoothing curve.
+
         @beginWxPerlOnly
         Not supported by wxPerl.
         @endWxPerlOnly
+
+        @image html drawing-spline.png
     */
     void DrawSpline(int n, const wxPoint points[]);