diff --git a/src/Fl_Copy_Surface.cxx b/src/Fl_Copy_Surface.cxx
index 7e07928ab..c95d787b2 100644
--- a/src/Fl_Copy_Surface.cxx
+++ b/src/Fl_Copy_Surface.cxx
@@ -19,7 +19,7 @@
 #include <FL/Fl_Copy_Surface.H>
 
 #if defined(FL_PORTING)
-# pragma message "FL_PORTING: implement class Fl_XXX_Copy_Surface_Driver for your platform"
+# pragma message "FL_PORTING: optionally implement class Fl_XXX_Copy_Surface_Driver for your platform"
 
 Fl_Copy_Surface_Driver *Fl_Copy_Surface_Driver::newCopySurfaceDriver(int w, int h)
 {
diff --git a/src/Fl_Image_Surface.cxx b/src/Fl_Image_Surface.cxx
index 83bc421c3..227186c26 100644
--- a/src/Fl_Image_Surface.cxx
+++ b/src/Fl_Image_Surface.cxx
@@ -19,7 +19,7 @@
 #include <FL/Fl_Image_Surface.H>
 
 #if defined(FL_PORTING)
-# pragma message "FL_PORTING: implement class Fl_XXX_Image_Surface_Driver for your platform"
+# pragma message "FL_PORTING: optionally implement class Fl_XXX_Image_Surface_Driver for your platform"
 Fl_Image_Surface_Driver *Fl_Image_Surface_Driver::newImageSurfaceDriver(int w, int h, int high_res, Fl_Offscreen)
 {
   return NULL;