diff --git a/interface/wx/dialog.h b/interface/wx/dialog.h
index 432becf5ca..6dfe57cf7a 100644
--- a/interface/wx/dialog.h
+++ b/interface/wx/dialog.h
@@ -294,9 +294,14 @@ public:
        Splits text up at newlines and places the lines into wxStaticText
        objects with the specified maximum width in a vertical wxBoxSizer.
 
-       @a widthMax is available since 3.1.0
+       If @a widthMax has its default value of -1, only explicit new line
+       characters in @a message are taken into account. Otherwise, lines are
+       broken either after a new line or wrapped, at word boundary, if their
+       width would become bigger than the specified maximal width.
 
-       @param widthMax Specifies the text's maximum width.
+       @param widthMax Specifies the text's maximum width (this argument is
+        available since version 3.1.1, previous versions always behaved as if
+        the maximal width of -1 was specified).
 
        @see wxStaticText::Wrap(int width)
     */