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diff --git a/pbmmake.html b/pbmmake.html
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+++ b/pbmmake.html
@@ -40,12 +40,11 @@ command line options:
 <dt><b>-black</b>
 <dt><b>-gray</b>
 
-<p>In addition to the usual <b>-white</b> and <b>-black</b>, this
-program implements <b>-gray</b>.  This gives a simple 50% gray pattern
-with 1's and 0's alternating.
+<p>These options specify the color of the output.  <b>-white</b> means
+all pixels are white.  <b>-black</b> means all pixels are black.
+<b>-gray</b> means black and white pixels alternate.
 
-<p>With none of the above specified, the output image will be entirely
-white.
+<p>You may specify only one of these.  The default is all white.
 
 </dl>