update man page

1 files changed, 3 insertions, 0 deletions

diff --git a/pnmcurve.1 b/pnmcurve.1
index 89cb8c4..cac4efb 100644
--- a/pnmcurve.1
+++ b/pnmcurve.1
@@ -19,6 +19,9 @@ applies the resulting spline curve to the pnm image read
 from stdin and writes the resulting image to stdout.
 Command line switches allow to apply the curve only to
 selected color channels.
+By default
+.Nm
+applies the curve to all color channels.
 .Pp
 The options are as follows:
 .Bl -tag -width indent