diff --git a/Manifest.txt b/Manifest.txt
index d4cc6ce..8df9095 100644
--- a/Manifest.txt
+++ b/Manifest.txt
@@ -1,6 +1,6 @@
 History.txt
 Manifest.txt
-README.txt
+README.rdoc
 Rakefile
 lib/geocoder/us/database.rb
 lib/geocoder/us/numbers.rb
diff --git a/gemspec b/gemspec
index 7b6b1f7..3aaaf89 100644
--- a/gemspec
+++ b/gemspec
@@ -10,5 +10,5 @@ Gem::Specification.new do |s|
     s.require_path  = "lib"
     s.test_files    = "tests/run.rb"
     s.has_rdoc      = true
-    s.extra_rdoc_files  =   ["README.txt"]
+    s.extra_rdoc_files  =   ["README.rdoc"]
 end