diff --git a/FL/Fl_Printer.H b/FL/Fl_Printer.H
index d7840dcfe..0b53c49e0 100644
--- a/FL/Fl_Printer.H
+++ b/FL/Fl_Printer.H
@@ -130,7 +130,12 @@ public:
  <p><b>Platform specifics</b>
  <ul>
  <li>Unix/Linux platforms:
- Class Fl_RGB_Image prints but loses its transparency if it has one.
+ Unless it has been previously changed, the default paper size is A4.
+ To change that, press the "Properties" button of the "Print" dialog window
+ opened by an Fl_Printer::start_job() call. This opens a "Printer Properties" window where it's
+ possible to select the adequate paper size. Finally press the "Save" button therein to assign
+ the chosen paper size to the chosen printer for this and all further print operations.
+ <br>Class Fl_RGB_Image prints but loses its transparency if it has one.
  See class Fl_PostScript_Graphics_Driver for a description of how UTF-8 strings appear in print.
  Use the static public attributes of this class to set the print dialog to other languages 
  than English. For example, the "Printer:" dialog item Fl_Printer::dialog_printer can be set to French with: