diff --git a/interface/wx/window.h b/interface/wx/window.h
index 07b80d664b..2918be982a 100644
--- a/interface/wx/window.h
+++ b/interface/wx/window.h
@@ -2202,7 +2202,8 @@ public:
         should use Update() instead.
 
         @param eraseBackground
-            If @true, the background will be erased.
+            If @true, the background will be erased too. Note that in non-MSW
+            ports background is always erased.
         @param rect
             If non-@NULL, only the given rectangle will be treated as damaged.