diff --git a/FL/Fl_Copy_Surface.H b/FL/Fl_Copy_Surface.H
index 9fb5021c7..593d13a69 100644
--- a/FL/Fl_Copy_Surface.H
+++ b/FL/Fl_Copy_Surface.H
@@ -27,7 +27,7 @@
  will be recorded in the clipboard. It's possible to draw widgets (using Fl_Copy_Surface::draw()
  ) or to use any of the \ref fl_drawings or the \ref fl_attributes.
  Finally, delete the Fl_Copy_Surface object to load the clipboard with the graphical data.
- <br> Fl_GL_Window 's can be copied to the clipboard as well. 
+ <br> Fl_Gl_Window 's can be copied to the clipboard as well. 
  <br> Usage example:
  \code
  Fl_Widget *g = ...; // a widget you want to copy to the clipboard
diff --git a/FL/Fl_Device.H b/FL/Fl_Device.H
index daf0ec63d..033aa7523 100644
--- a/FL/Fl_Device.H
+++ b/FL/Fl_Device.H
@@ -45,7 +45,8 @@ class Fl_Widget;
  current drawing surface (not necessary with class Fl_Printer because it is done by Fl_Printer::begin_job()).
  <li> At this point all of the \ref fl_drawings (e.g., fl_rect()) or the \ref fl_attributes or \ref drawing_images functions
  (e.g., fl_draw_image(), Fl_Image::draw()) operate on the new current drawing surface.
- Certain drawing surfaces allow additional ways to draw to them (e.g., Fl_Printer::print_widget(), Fl_Image_Surface::draw()).
+ Drawing surfaces from Fl_Widget_Surface derived classes allow additional ways
+ to draw to them (e.g., Fl_Printer::print_widget(), Fl_Image_Surface::draw()).
  <li> After all drawing requests have been performed, redirect graphics requests back to their previous destination
  with \c Fl_Surface_Device::pop_current();.
  <li> Delete \c surface.