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diff --git a/sec/intro.ltx b/sec/intro.ltx
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@@ -52,7 +52,9 @@ Developing these non-trivial recursive programs requires good tools
for using \lang{}. To that end, we have implemented a certifying type
checker and a compiler into Scheme. Our type checker not only checks
whether a \lang{} program is well/ill-typed, but it also provides a
-proof for its decision.
+proof for its decision. The compiler needs this certificate when
+compiling \lang{} into Scheme, so that it has enough type information
+to compile \foldkw{}.
\subsubsection*{Contributions}%
In this paper we: