diff --git a/interface/wx/pen.h b/interface/wx/pen.h
index e5128cc519..54e12c02a0 100644
--- a/interface/wx/pen.h
+++ b/interface/wx/pen.h
@@ -8,6 +8,9 @@
 
 /**
     The possible styles for a wxPen.
+
+    Note that hatched pen styles are not supported by X11-based ports,
+    including wxGTK.
 */
 enum wxPenStyle
 {