diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index cf20d99..256a14f 100644
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -72,16 +72,34 @@ Item
   <filename>current_logfiles</>
  </entry>
  <entry>
-  A file recording the current log file(s) used by the syslogger and
-  its log format, <systemitem>stderr</> or <systemitem>csvlog</>. Each line
-  of the file is a space separated list of two elements: the log format and
-  the full path to the log file including the value
-  of <xref linkend="guc-log-directory">. The log format must be present
-  in <xref linkend="guc-log-destination"> to be listed in the file. This file
+  <para>A file recording the log file(s) currently written to by the syslogger
+  and the file's log formats, <systemitem>stderr</>
+  or <systemitem>csvlog</>. Each line of the file is a space separated list of
+  two elements: the log format and the full path to the log file including the
+  value of <xref linkend="guc-log-directory">.</para>
+
+  <para>During server startup <filename>current_logfiles</filename> reports
+  the default server log destination.  After server startup the log format
+  must be present in <xref linkend="guc-log-destination"> to be listed in
+  <filename>current_logfiles</filename>.</para>
+
+  <note>
+    <para>Non-<productname>PostgreSQL</productname> log sources, such as 3rd
+    party libraries, which deliver error messages directly to stderr are
+    always logged by <productname>PostgreSQL</productname> to stderr.  Stderr
+    is also the destination for any incomplete log messages produced by
+    <productname>PostgreSQL</productname>.  When
+    <systemitem>stderr</systemitem> is not in
+    <xref linkend="guc-log-destination">,
+    <filename>current_logfiles</filename> does not not contain the name of the
+    file where these sorts of log messages are written.</para>
+  </note>
+  
+  <para>The <filename>current_logfiles</filename> file
   is present only when <xref linkend="guc-logging-collector"> is
   activated and when at least one of <systemitem>stderr</> or
   <systemitem>csvlog</> value is present in
-<xref linkend="guc-log-destination">.</entry>
+  <xref linkend="guc-log-destination">.</para></entry>
 </row>
 
 <row>