Fixing typo on the powered-by page.
diff --git a/src/main/docgen/book.xml b/src/main/docgen/book.xml
index 524cb09..1cee0be 100644
--- a/src/main/docgen/book.xml
+++ b/src/main/docgen/book.xml
@@ -599,7 +599,7 @@
FreeMarker.</para>
<para>If you are a developer (or otherwise a representative) of a
- product or site that uses FreeMarker <emphasis>and has a substantially
+ product or site that uses FreeMarker <emphasis>and has a substantial
user base for at least a year or so</emphasis>, <olink
targetdoc="devMailingList">drop us a note</olink> that includes a short
one paragraph description (preferably less than 300 characters, or 600
