diff --git a/Gemfile b/Gemfile
index bb500a6..3d42e01 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 source 'https://rubygems.org'
 
 gem 'commonmarker', '~> 0.16', require: false
diff --git a/Rakefile b/Rakefile
index f6ed6cf..13f3725 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'bundler/gem_tasks'
 require 'rake/testtask'
 
diff --git a/graphql-docs.gemspec b/graphql-docs.gemspec
index f63a840..d5bbabd 100644
--- a/graphql-docs.gemspec
+++ b/graphql-docs.gemspec
@@ -1,4 +1,5 @@
 # coding: utf-8
+# frozen_string_literal: true
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'graphql-docs/version'
diff --git a/lib/graphql-docs.rb b/lib/graphql-docs.rb
index 52d4e7e..d1a326c 100644
--- a/lib/graphql-docs.rb
+++ b/lib/graphql-docs.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'graphql-docs/helpers'
 require 'graphql-docs/renderer'
 require 'graphql-docs/configuration'
diff --git a/lib/graphql-docs/configuration.rb b/lib/graphql-docs/configuration.rb
index 435a6f4..4a6fe12 100644
--- a/lib/graphql-docs/configuration.rb
+++ b/lib/graphql-docs/configuration.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module GraphQLDocs
   module Configuration
     GRAPHQLDOCS_DEFAULTS = {
diff --git a/lib/graphql-docs/generator.rb b/lib/graphql-docs/generator.rb
index e7af8f8..af8cd2c 100644
--- a/lib/graphql-docs/generator.rb
+++ b/lib/graphql-docs/generator.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'erb'
 require 'sass'
 
@@ -210,8 +211,9 @@ def write_file(type, name, contents, trim: true)
         contents.gsub!(/^\s{4}/m, '  ')
       end
 
-      contents = @renderer.render(contents, type: type, name: name)
-      File.write(File.join(path, 'index.html'), contents) unless contents.nil?
+      filename = File.join(path, 'index.html')
+      contents = @renderer.render(contents, type: type, name: name, filename: filename)
+      File.write(filename, contents) unless contents.nil?
     end
   end
 end
diff --git a/lib/graphql-docs/helpers.rb b/lib/graphql-docs/helpers.rb
index e9127e2..2c40a1f 100644
--- a/lib/graphql-docs/helpers.rb
+++ b/lib/graphql-docs/helpers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module GraphQLDocs
   module Helpers
     SLUGIFY_PRETTY_REGEXP = Regexp.new("[^[:alnum:]._~!$&'()+,;=@]+").freeze
diff --git a/lib/graphql-docs/parser.rb b/lib/graphql-docs/parser.rb
index b114abc..9e22c74 100644
--- a/lib/graphql-docs/parser.rb
+++ b/lib/graphql-docs/parser.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'graphql'
 
 module GraphQLDocs
diff --git a/lib/graphql-docs/renderer.rb b/lib/graphql-docs/renderer.rb
index 71a993c..0a1d6fd 100644
--- a/lib/graphql-docs/renderer.rb
+++ b/lib/graphql-docs/renderer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'html/pipeline'
 require 'yaml'
 require 'extended-markdown-filter'
@@ -36,17 +37,17 @@ def initialize(parsed_schema, options)
       @pipeline = HTML::Pipeline.new(filters, @pipeline_config[:context])
     end
 
-    def render(contents, type: nil, name: nil)
-      opts = { base_url: @options[:base_url] }.merge({ type: type, name: name}).merge(helper_methods)
+    def render(contents, type: nil, name: nil, filename: nil)
+      opts = { base_url: @options[:base_url], output_dir: @options[:output_dir] }.merge({ type: type, name: name, filename: filename}).merge(helper_methods)
 
-      contents = to_html(contents)
+      contents = to_html(contents, context: { filename: filename })
       return contents if @graphql_default_layout.nil?
       opts[:content] = contents
       @graphql_default_layout.result(OpenStruct.new(opts).instance_eval { binding })
     end
 
-    def to_html(string)
-      @pipeline.to_html(string)
+    def to_html(string, context: {})
+      @pipeline.to_html(string, context)
     end
 
     private
diff --git a/lib/graphql-docs/version.rb b/lib/graphql-docs/version.rb
index db1bb19..cc4f947 100644
--- a/lib/graphql-docs/version.rb
+++ b/lib/graphql-docs/version.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module GraphQLDocs
   VERSION = '1.4.1'
 end
diff --git a/test/graphql-docs/generator_test.rb b/test/graphql-docs/generator_test.rb
index 1d2ff54..62e8fe0 100644
--- a/test/graphql-docs/generator_test.rb
+++ b/test/graphql-docs/generator_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class GeneratorTest < Minitest::Test
@@ -5,7 +6,7 @@ class CustomRenderer
     def initialize(_, _)
     end
 
-    def render(contents, type: nil, name: nil)
+    def render(contents, type: nil, name: nil, filename: nil)
       to_html(contents)
     end
 
diff --git a/test/graphql-docs/graphql-docs_test.rb b/test/graphql-docs/graphql-docs_test.rb
index 327d383..28b6d3d 100644
--- a/test/graphql-docs/graphql-docs_test.rb
+++ b/test/graphql-docs/graphql-docs_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class GraphQLDocsTest < Minitest::Test
diff --git a/test/graphql-docs/parser_test.rb b/test/graphql-docs/parser_test.rb
index a67b699..a54faa1 100644
--- a/test/graphql-docs/parser_test.rb
+++ b/test/graphql-docs/parser_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class ParserTest < Minitest::Test
diff --git a/test/graphql-docs/renderer_test.rb b/test/graphql-docs/renderer_test.rb
index 284e0ee..35d6e7f 100644
--- a/test/graphql-docs/renderer_test.rb
+++ b/test/graphql-docs/renderer_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class RendererTest < Minitest::Test
@@ -19,4 +20,35 @@ def test_that_html_conversion_works
 
     assert_equal '<p><strong>R2D2</strong></p>', contents
   end
+
+  def test_that_filename_accessible_to_filters
+    @renderer = GraphQLDocs::Renderer.new(@parsed_schema, GraphQLDocs::Configuration::GRAPHQLDOCS_DEFAULTS.merge({
+      pipeline_config: {
+        pipeline:
+          %i(ExtendedMarkdownFilter
+             EmojiFilter
+             TableOfContentsFilter
+             AddFilenameFilter),
+        context: {
+          gfm: false,
+          asset_root: 'https://a248.e.akamai.net/assets.github.com/images/icons'
+        }
+      }
+    }))
+    contents = @renderer.render('<span id="fill-me"></span>', type: 'Droid', name: 'R2D2', filename: '/this/is/the/filename')
+    assert_match %r{<span id="fill-me">/this/is/the/filename</span>}, contents
+  end
+end
+
+class AddFilenameFilter < HTML::Pipeline::Filter
+  def call
+    doc.search('span[@id="fill-me"]').each do |span|
+      span.inner_html=(context[:filename])
+    end
+    doc
+  end
+
+  def validate
+    needs :filename
+  end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index be6d471..ed75626 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 $LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
 require 'graphql-docs'