Comment additional check in TCP.open method definition

lib/dalli/socket.rb

@@ -88,6 +88,12 @@ class TCP < TCPSocket
       # options - supports enhanced logging in the case of a timeout
       attr_accessor :options
 
+      # Check that TCPSocket#initialize was not overwritten by resolv-replace gem
+      # (part of ruby standard library since 3.0.0, should be removed in 3.4.0),
+      # as it does not handle keyword arguments correctly.
+      # To check this we are using the fact that resolv-replace
+      # aliases TCPSocket#initialize method to #original_resolv_initialize.
+      # https://github.com/ruby/resolv-replace/blob/v0.1.1/lib/resolv-replace.rb#L8
       if RUBY_VERSION >= '3.0' &&
          !::TCPSocket.private_instance_methods.include?(:original_resolv_initialize)
         def self.open(host, port, options = {})