Index: doc/src/sgml/libpq.sgml
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RCS file: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v
retrieving revision 1.288
diff -c -c -r1.288 libpq.sgml
*** doc/src/sgml/libpq.sgml	27 Apr 2009 16:27:36 -0000	1.288
--- doc/src/sgml/libpq.sgml	28 May 2009 20:01:37 -0000
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*** 64,69 ****
--- 64,79 ----
     whether a connection was successfully made before queries are sent
     via the connection object.
  
+    <warning>
+     <para>
+      On Unix, forking a process with open libpq connections can lead to
+      unpredictable results because the parent and child processes share
+      the same sockets and operating system resources.  For this reason,
+      such usage is not recommended, though doing an <function>exec</> from
+      the child process to load a new executable is safe.
+     </para>
+    </warning>
+ 
     <note>
      <para>
       On Windows, there is a way to improve performance if a single