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-rw-r--r--pamgauss.html3
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diff --git a/pamgauss.html b/pamgauss.html
index 48725823..899077f9 100644
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@@ -136,6 +136,9 @@ the sample.
 <p>The default is 5 divided by the standard deviation, rounded up to a whole
 number.
 
+<p>This option was new in Netpbm 10.79 (June 2017).  Before that, there
+it is essentially 1 - there is no oversampling.
+
 </dl>
 
 <H2 id="seealso">SEE ALSO</H2>