diff --git a/interface/wx/dc.h b/interface/wx/dc.h
index e5af4c2491..2f28a7b869 100644
--- a/interface/wx/dc.h
+++ b/interface/wx/dc.h
@@ -714,6 +714,8 @@ public:
     /**
         Draws a spline between all given points using the current pen.
 
+        The number of points must be at least 3 for the spline to be drawn.
+
         @beginWxPerlOnly
         Not supported by wxPerl.
         @endWxPerlOnly