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@@ -217,8 +217,8 @@ than the image's maxval.  I.e. it isn't even a real PNM file.
 
 <p>The way you select this method of supplying the convolution matrix is to
 <em>not</em> specify <b>-matrix</b> or <b>-matrixfile</b>.  When you do that,
-you must specify a second non-option argument -- that is the name of the PNM
-file (or PNM equivalent PAM file).
+you must specify the name of the PNM file (or PNM equivalent PAM file) as a
+non-option argument (before the optional input file name).
 
 <p>There are two ways <b>pnmconvol</b> interprets the PNM convolution matrix
 image pixels as weights: with offsets, and without offsets.