diff --git a/lib/docs/core/filter.rb b/lib/docs/core/filter.rb
index 031c25eb..0209d7b2 100644
--- a/lib/docs/core/filter.rb
+++ b/lib/docs/core/filter.rb
@@ -50,6 +50,10 @@ module Docs
       subpath.blank? || subpath == '/' || subpath == root_path
     end
 
+    def initial_page?
+      root_page? || context[:initial_paths].include?(subpath)
+    end
+
     SCHEME_RGX = /\A[^:\/?#]+:/
 
     def fragment_url_string?(str)
diff --git a/test/lib/docs/core/filter_test.rb b/test/lib/docs/core/filter_test.rb
index 107627ef..d98ecdad 100644
--- a/test/lib/docs/core/filter_test.rb
+++ b/test/lib/docs/core/filter_test.rb
@@ -78,6 +78,27 @@ class DocsFilterTest < MiniTest::Spec
     end
   end
 
+  describe "#initial_page?" do
+    before do
+      context[:initial_paths] = ['initial']
+      stub(filter).root_page? { false }
+    end
+
+    it "returns true when #root_page? is true" do
+      stub(filter).root_page? { true }
+      assert filter.initial_page?
+    end
+
+    it "returns true when #subpath is included in :initial_paths" do
+      stub(filter).subpath { 'initial' }
+      assert filter.initial_page?
+    end
+
+    it "returns false otherwise" do
+      refute filter.initial_page?
+    end
+  end
+
   describe "#fragment_url_string?" do
     it "returns false with ''" do
       refute filter.fragment_url_string?('')