diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 232b37286..1e4c9ae8e 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -725,8 +725,6 @@ class IMAP < Protocol
       "UTF8=ONLY" => "UTF8=ACCEPT",
     }.freeze
 
-    autoload :Config,      File.expand_path("imap/config",       __dir__)
-
     autoload :SASL,        File.expand_path("imap/sasl",         __dir__)
     autoload :SASLAdapter, File.expand_path("imap/sasl_adapter", __dir__)
     autoload :StringPrep,  File.expand_path("imap/stringprep",   __dir__)
@@ -2981,6 +2979,7 @@ def self.saslprep(string, **opts)
 end
 
 require_relative "imap/errors"
+require_relative "imap/config"
 require_relative "imap/command_data"
 require_relative "imap/data_encoding"
 require_relative "imap/flags"
diff --git a/lib/net/imap/config.rb b/lib/net/imap/config.rb
index f8201c5ca..5a3f86f96 100644
--- a/lib/net/imap/config.rb
+++ b/lib/net/imap/config.rb
@@ -57,9 +57,7 @@ def self.[](config) # :nodoc: unfinished API
 
       # The debug mode (boolean)
       #
-      # | Starting with version | The default value is |
-      # |-----------------------|----------------------|
-      # | _original_            | +false+              |
+      # The default value is +false+.
       attr_accessor :debug, type: :boolean
 
       # method: debug?
@@ -72,17 +70,13 @@ def self.[](config) # :nodoc: unfinished API
       # If the IMAP object cannot open a connection within this time,
       # it raises a Net::OpenTimeout exception.  See Net::IMAP.new.
       #
-      # | Starting with version | The default value is |
-      # |-----------------------|----------------------|
-      # | _original_            | +30+ seconds         |
+      # The default value is +30+ seconds.
       attr_accessor :open_timeout, type: Integer
 
       # Seconds to wait until an IDLE response is received, after
       # the client asks to leave the IDLE state.  See Net::IMAP#idle_done.
       #
-      # | Starting with version | The default value is |
-      # |-----------------------|----------------------|
-      # | _original_            | +5+ seconds          |
+      # The default value is +5+ seconds.
       attr_accessor :idle_response_timeout, type: Integer
 
       # Creates a new config object and initialize its attribute with +attrs+.