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diff --git a/man/man1/proj.1 b/man/man1/proj.1
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@@ -135,6 +135,22 @@ For conformal projections meridinal and parallel scales factors
will be equal and angular distortion zero.
Equal area projections will have an area factor of 1.
.TP
+.BI \-m " mult"
+The cartesian data may be scaled by the
+.I mult
+parameter.
+When processing data in a forward projection mode the
+cartesian output values are multiplied by
+.I mult
+otherwise the input cartesian values are divided by
+.I mult
+before inverse projection.
+If the first two characters of
+.I mult
+are 1/ or 1: then the reciprocal value of
+.I mult
+is employed.
+.TP
.BI \-f " format"
.I Format
is a