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-rw-r--r--guides/source/configuring.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/guides/source/configuring.md b/guides/source/configuring.md
index 9bb5d621fc..2f5444c763 100644
--- a/guides/source/configuring.md
+++ b/guides/source/configuring.md
@@ -103,6 +103,8 @@ numbers. New applications filter out passwords by adding the following `config.f
* `config.force_ssl` forces all requests to be under HTTPS protocol by using `ActionDispatch::SSL` middleware.
+* `config.log_formatter` defines the formatter of the Rails logger. This option defaults to a instance of `ActiveSupport::Logger::SimpleFormatter` for all modes except production, where it defaults to `Logger::Formatter`.
+
* `config.log_level` defines the verbosity of the Rails logger. This option defaults to `:debug` for all modes except production, where it defaults to `:info`.
* `config.log_tags` accepts a list of methods that respond to `request` object. This makes it easy to tag log lines with debug information like subdomain and request id — both very helpful in debugging multi-user production applications.