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+++ b/ppmpat.html
@@ -2,7 +2,7 @@
 <html><head><title>Ppmpat User Manual</title></head>
 <body>
 <h1>ppmpat</h1>
-Updated: 02 March 2016
+Updated: 12 November 2023
 <br>
 <a href="#index">Table Of Contents</a>
 
@@ -90,8 +90,11 @@ in that order.
 
 <dt><b>-poles</b>
 
-<dd>Color gradients centered on randomly-placed poles.
-
+<dd>Color gradients centered on randomly-placed poles: a Voronoi diagram.
+    
+<p>(There are many examples of this pattern in nature.  One is the hide of a
+giraffe).
+  
 <p>If you specify -color, give two or more colors.
 
 <dt><b>-squig</b>