diff --git a/.document b/.document
new file mode 100644
index 0000000..9afc0d8
--- /dev/null
+++ b/.document
@@ -0,0 +1,5 @@
+ChangeLog
+LICENSE.txt
+README.md
+ext/
+lib/
diff --git a/Rakefile b/Rakefile
index ff5b761..18a7e4e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -25,7 +25,6 @@ end
 task "rdoc" =>  "changelogs"
 RDoc::Task.new do |rdoc|
   rdoc.main = "README.md"
-  rdoc.rdoc_files.include("LICENSE.txt", "ChangeLog", "*.md", "lib/**/*.rb", "ext/**/*.c")
 end
 
 task :test => :compile
diff --git a/ext/etc/.document b/ext/etc/.document
new file mode 100644
index 0000000..2b0d7eb
--- /dev/null
+++ b/ext/etc/.document
@@ -0,0 +1 @@
+etc.c
diff --git a/ext/etc/etc.c b/ext/etc/etc.c
index 23127ca..842a40f 100644
--- a/ext/etc/etc.c
+++ b/ext/etc/etc.c
@@ -1118,6 +1118,7 @@ Init_etc(void)
     RB_EXT_RACTOR_SAFE(true);
 #endif
     mEtc = rb_define_module("Etc");
+    /* The version */
     rb_define_const(mEtc, "VERSION", rb_str_new_cstr(RUBY_ETC_VERSION));
     init_constants(mEtc);
 
diff --git a/lib/io.rb b/lib/io.rb
new file mode 100644
index 0000000..e238fca
--- /dev/null
+++ b/lib/io.rb
@@ -0,0 +1,3 @@
+# :stopdoc:
+class IO;end
+# :startdoc: