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diff --git a/libred.7 b/libred.7
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--- a/libred.7
+++ b/libred.7
@@ -8,6 +8,7 @@ and colours temperatures.
 .SH SEE ALSO
 .BR libred.h (0),
 .BR solar-python (7),
+.BR radharc (1),
 .BR redshift (1),
 .BR blueshift (1),
 .BR libgamma (7)