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diff --git a/doc/trouble.doc b/doc/trouble.doc
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@@ -71,6 +71,8 @@
<li>Version 1.8.6 of dot (and maybe earlier versions too) do not
generate proper map files, causing the graphs that doxygen generates
not to be properly clickable.
+<li>PHP only: Doxygen requires that all PHP statements (i.e. code) is
+ wrapped in a functions/methods, otherwise you may run into parse problems.
</ul>