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diff --git a/doc/gawktexi.in b/doc/gawktexi.in
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@@ -42955,3 +42955,8 @@ which sorta sucks.
TODO:
Check that all dark corners are indexed properly.
+
+Add a section explaining recursion from ground zero. Probably
+easiest to do it with factorial as the example. Explain that
+recursion needs a stopping condition. Thanks to
+Bill Duncan <bduncan@beachnet.org> for the suggestion.