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-rw-r--r--lib/logger.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/logger.rb b/lib/logger.rb
index b2086dc8d3..5e88574aa5 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -350,7 +350,8 @@ class Logger
#
# +logdev+::
# The log device. This is a filename (String), IO object (typically
- # +STDOUT+, +STDERR+, or an open file) or nil (it writes nothing).
+ # +STDOUT+, +STDERR+, or an open file), +nil+ (it writes nothing) or
+ # +File::NULL+ (same as +nil+).
# +shift_age+::
# Number of old log files to keep, *or* frequency of rotation (+daily+,
# +weekly+ or +monthly+). Default value is 0, which disables log file