diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 2a73277f..36d2a9b4 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,19 +1,14 @@
 # Remove these configuration records
 # one by one as the offenses are removed from the code base.
 
-# Offense count: 19
 Metrics/AbcSize:
-  Max: 46 # Goal: 15
+  Max: 43 # Goal: 15
 
-# Offense count: 6
 Metrics/CyclomaticComplexity:
-  Max: 13
+  Max: 13 # Goal: 6
 
-# Offense count: 2
-# Configuration parameters: CountComments.
 Metrics/ModuleLength:
   Max: 299
 
-# Offense count: 6
 Metrics/PerceivedComplexity:
-  Max: 16
+  Max: 16 # Goal: 7
diff --git a/lib/paper_trail/has_paper_trail.rb b/lib/paper_trail/has_paper_trail.rb
index 6a26c429..6817d748 100644
--- a/lib/paper_trail/has_paper_trail.rb
+++ b/lib/paper_trail/has_paper_trail.rb
@@ -54,6 +54,7 @@ module PaperTrail
       #   other models latest state (if the other model is paper trailed, this
       #   option does nothing)
       #
+      # @api public
       def has_paper_trail(options = {})
         options[:on] ||= [:create, :update, :destroy]
 
@@ -102,6 +103,9 @@ module PaperTrail
           end
       end
 
+      # Installs callbacks, associations, "class attributes", and more.
+      # For details of how "class attributes" work, see the activesupport docs.
+      # @api private
       def setup_model_for_paper_trail(options = {})
         # Lazily include the instance methods so we don't clutter up
         # any more ActiveRecord models than we have to.
@@ -117,18 +121,7 @@ module PaperTrail
         class_attribute :version_class_name
         self.version_class_name = options[:class_name] || "PaperTrail::Version"
 
-        class_attribute :paper_trail_options
-
-        self.paper_trail_options = options.dup
-
-        [:ignore, :skip, :only].each do |k|
-          paper_trail_options[k] = [paper_trail_options[k]].flatten.compact.map { |attr|
-            attr.is_a?(Hash) ? attr.stringify_keys : attr.to_s
-          }
-        end
-
-        paper_trail_options[:meta] ||= {}
-        paper_trail_options[:save_changes] = true if paper_trail_options[:save_changes].nil?
+        setup_paper_trail_options(options)
 
         class_attribute :versions_association_name
         self.versions_association_name = options[:versions] || :versions
@@ -153,6 +146,22 @@ module PaperTrail
         after_rollback :clear_rolled_back_versions
       end
 
+      # Given `options`, populates `paper_trail_options`.
+      # @api private
+      def setup_paper_trail_options(options)
+        class_attribute :paper_trail_options
+        self.paper_trail_options = options.dup
+        [:ignore, :skip, :only].each do |k|
+          paper_trail_options[k] = [paper_trail_options[k]].flatten.compact.map { |attr|
+            attr.is_a?(Hash) ? attr.stringify_keys : attr.to_s
+          }
+        end
+        paper_trail_options[:meta] ||= {}
+        if paper_trail_options[:save_changes].nil?
+          paper_trail_options[:save_changes] = true
+        end
+      end
+
       def setup_callbacks_from_options(options_on = [])
         options_on.each do |option|
           send "paper_trail_on_#{option}"