diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 6e72e3f39..82c478ed0 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -245,8 +245,7 @@ class IMAP < Protocol
     # Seconds to wait until an IDLE response is received.
     attr_reader :idle_response_timeout
 
-    # The thread to receive exceptions.
-    attr_accessor :client_thread
+    attr_accessor :client_thread # :nodoc:
 
     # Returns the debug mode.
     def self.debug
diff --git a/lib/net/imap/errors.rb b/lib/net/imap/errors.rb
index 33dd541ce..b353756fc 100644
--- a/lib/net/imap/errors.rb
+++ b/lib/net/imap/errors.rb
@@ -51,7 +51,7 @@ class ByeResponseError < ResponseError
     class UnknownResponseError < ResponseError
     end
 
-    RESPONSE_ERRORS = Hash.new(ResponseError)
+    RESPONSE_ERRORS = Hash.new(ResponseError) # :nodoc:
     RESPONSE_ERRORS["NO"] = NoResponseError
     RESPONSE_ERRORS["BAD"] = BadResponseError