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diff --git a/sys/pmio/pmpoint.x b/sys/pmio/pmpoint.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <pmset.h>
+include	<plio.h>
+
+# PM_POINT -- Perform a rasterop operation on a single point in a line of a
+# 2-dimensional plane of a mask.  If the dimensionality of the mask exceeds 2,
+# the pm_setplane() procedure should be called first to define the plane of
+# the mask to be modified.
+
+procedure pm_point (pl, x, y, rop)
+
+pointer	pl			#I mask descriptor
+int	x			#I pixel to be modified
+int	y			#I line to be modified
+int	rop			#I rasterop defining operation
+
+errchk	pl_getplane
+include	"pmio.com"
+
+begin
+	if (PM_MAPXY(pl) == YES) {
+	    call pl_getplane (pl, v1)
+	    v1[1] = x;  v1[2] = y
+	    call imaplv (PM_REFIM(pl), v1, v2, PM_MAXDIM)
+
+	    call pl_point (pl, v2[1], v2[2], rop)
+
+	} else
+	    call pl_point (pl, x, y, rop)
+end