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diff --git a/man/cg-gamma.1 b/man/cg-gamma.1
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@@ -54,6 +54,9 @@ By default, the filter is applied to all monitors.
.B \-d
Keep the process alive and remove the filter on death.
.TP
+.B \-f " "\fIfile\fP
+Read the gamma values from the selected file.
+.TP
.BR \-M " "\fImethod\fP
Adjustment method name or number. Recognised names include: