Added paragraph about potential re-initialization of extension
modules; responding to suggestion by Robin Boerdijk
<Robin.Boerdijk@nl.origin-it.com>.
diff --git a/Doc/ext/ext.tex b/Doc/ext/ext.tex
index d645af7..33d6492 100644
--- a/Doc/ext/ext.tex
+++ b/Doc/ext/ext.tex
@@ -406,6 +406,13 @@
if the module could not be initialized satisfactorily, so the caller
doesn't need to check for errors.
+\strong{Note:} Removing entries from \code{sys.modules} or importing
+compiled modules into multiple interpreters within a process (or
+following a \cfunction{fork()} without an intervening
+\cfunction{exec()}) can create problems for some extension modules.
+Extension module authors should exercise caution when initializing
+internal data structures.
+
\section{Compilation and Linkage
\label{compilation}}