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-rw-r--r--desktop/plotters.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/desktop/plotters.h b/desktop/plotters.h
index c2ce389d5..23f3d8e8d 100644
--- a/desktop/plotters.h
+++ b/desktop/plotters.h
@@ -55,7 +55,8 @@ struct bitmap;
* group_start - Start of a group of objects. Used when plotter implements
* export to a vector graphics file format. (Optional.)
* group_end - End of the most recently started group. (Optional.)
- * flush -
+ * flush - Only used internally by the knockout code. Should be NULL in
+ * any front end display plotters or export plotters.
*
* Plotter options:
* option_knockout - Optimisation particularly for unaccelerated screen