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-rw-r--r--doc/src/sgml/config.sgml10
1 files changed, 8 insertions, 2 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 370aa09ee7c..697cf401374 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -3941,8 +3941,14 @@ local0.* /var/log/postgresql
that are replaced with status information as outlined below.
Unrecognized escapes are ignored. Other
characters are copied straight to the log line. Some escapes are
- only recognized by session processes, and are ignored by
- background processes such as the main server process.
+ only recognized by session processes, and will be treated as empty by
+ background processes such as the main server process. Status
+ information may be aligned either left or right by specifying a
+ numeric literal after the % and before the option. A negative
+ value will cause the status information to be padded on the
+ right with spaces to give it a minimum width, whereas a positive
+ value will pad on the left. Padding can be useful to aid human
+ readability in log files.
This parameter can only be set in the <filename>postgresql.conf</>
file or on the server command line. The default is an empty string.