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-rw-r--r--pamchannel.html4
1 files changed, 4 insertions, 0 deletions
diff --git a/pamchannel.html b/pamchannel.html
index 548bf1e6..a8913d65 100644
--- a/pamchannel.html
+++ b/pamchannel.html
@@ -29,6 +29,10 @@ space in place of the equals sign to separate an option name from its value.
 PAM image as output, consisting of the indicated channels (planes) of
 the input.
 
+<p>Each <i>channum</i> argument is the number of a channel of the input,
+with the first channel being zero.  The channels in the output are in the
+order of these arguments.
+
 <P>The output is the same dimensions as the input, except that the depth
 is the number of <I>channum</I> arguments you supply.  The tuple type
 is a null string unless you specify the <B>-tupletype</B> option.