Update README

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@@ -8,6 +8,11 @@ It is similar to Markdown, but it has a few key advantages:
 
 Em takes plain-text readability seriously.  You should be able to
 write em in a plain-text e-mail message without the recipient noticing.
+On the other hand, that means that it is limited in terms of what HTML
+it can produce.  Most noticeably, only a very limited form of inline links
+are supported (see *Lists* and *Inline formatting*).
+
+== Implementation ==
 
 Em is implemented as a portable awk script, whose simplicity speaks
 for the benefits of em.