Add documentation link to strftime supported options.

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 4b351695a495d6f936c8b3bb8d5395b6d85cb7be..615b2b078bf9053f7f2f7f451886ab8c5c20b3df 100644 (file)
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -3086,6 +3086,10 @@ local0.*    /var/log/postgresql
         any time-zone-dependent %-escapes, the computation
         is done in the zone specified
         by .)
+        The supported %-escapes are similar to those
+        listed in the Open Group's 
+        url="http://pubs.opengroup.org/onlinepubs/009695399/functions/strftime.html">strftime
+         specification.
         Note that the system's strftime is not used
         directly, so platform-specific (nonstandard) extensions do not work.