diff --git a/lib/bson/bson_c.rb b/lib/bson/bson_c.rb
index 977b6f7..17f3758 100644
--- a/lib/bson/bson_c.rb
+++ b/lib/bson/bson_c.rb
@@ -29,10 +29,12 @@ module BSON
     end
 
     def self.max_bson_size
+      warn "BSON::BSON_CODER.max_bson_size is deprecated and will be removed in v2.0."
       CBson.max_bson_size
     end
 
     def self.update_max_bson_size(connection)
+      warn "BSON::BSON_CODER.update_max_bson_size is deprecated and now a no-op. It will be removed in v2.0."
       CBson.update_max_bson_size(connection)
     end
   end
diff --git a/lib/bson/bson_java.rb b/lib/bson/bson_java.rb
index 7a1eb0d..aaea901 100644
--- a/lib/bson/bson_java.rb
+++ b/lib/bson/bson_java.rb
@@ -18,10 +18,12 @@ module BSON
     end
 
     def self.max_bson_size
+      warn "BSON::BSON_CODER.max_bson_size is deprecated and will be removed in v2.0."
       Java::OrgJbson::RubyBSONEncoder.max_bson_size(self)
     end
 
     def self.update_max_bson_size(connection)
+      warn "BSON::BSON_CODER.update_max_bson_size is deprecated and now a no-op. It will be removed in v2.0."
       Java::OrgJbson::RubyBSONEncoder.update_max_bson_size(self, connection)
     end
   end
diff --git a/lib/bson/bson_ruby.rb b/lib/bson/bson_ruby.rb
index 08f96a9..223bda5 100644
--- a/lib/bson/bson_ruby.rb
+++ b/lib/bson/bson_ruby.rb
@@ -78,10 +78,12 @@ module BSON
     end
 
     def self.update_max_bson_size(connection)
+      warn "BSON::BSON_CODER.update_max_bson_size is deprecated and now a no-op. It will be removed in v2.0."
       @@max_bson_size = connection.max_bson_size
     end
 
     def self.max_bson_size
+      warn "BSON::BSON_CODER.max_bson_size is deprecated and will be removed in v2.0."
       @@max_bson_size
     end