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diff --git a/doc/libgraphics.ms b/doc/libgraphics.ms
index feb1480..209094d 100644
--- a/doc/libgraphics.ms
+++ b/doc/libgraphics.ms
@@ -152,3 +152,12 @@ arrow from Tiles.Tn.e to Raster.Rn.w
.PE
.B "Figure 3" :
Raster task scheduling.
+.SH
+Frames of reference
+.PP
+Frames are right-handed throughout every stage.
+.PS
+.ps 7
+
+.ps 10
+.PE