diff --git a/.gitignore b/.gitignore
index 9e33da1b6f..1580adedbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,7 +47,6 @@
 /enc.mk
 /enc/trans/*.c
 /encdb.h
-/ext/win32ole/.document
 /exts.mk
 /goruby
 /id.h
@@ -440,7 +439,6 @@
 /ext/win32ole/Makefile
 /ext/win32ole/mkmf.log
 /ext/win32ole/*.log
-/ext/win32ole/.document
 
 # /ext/zlib/
 /ext/zlib/*.def
diff --git a/ChangeLog b/ChangeLog
index 08adb80c2d..add0d6960a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Mar 18 00:59:38 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/win32ole/extconf.rb (create_docfile): removed.  should not
+	  modify source directory unnecessarily, platform dependent
+	  documentation should be dealt with by rdoc.  [ruby-core:35495]
+
 Fri Mar 18 00:54:20 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (rb_funcall_passing_block): add prototype.
diff --git a/ext/.document b/ext/.document
index e1b8ae2549..fda74e397b 100644
--- a/ext/.document
+++ b/ext/.document
@@ -59,5 +59,5 @@ ripper/lib
 socket
 stringio/stringio.c
 strscan/strscan.c
-win32ole
+win32ole/win32ole.c
 zlib/zlib.c
diff --git a/ext/win32ole/extconf.rb b/ext/win32ole/extconf.rb
index 95f229b041..c3717316d4 100644
--- a/ext/win32ole/extconf.rb
+++ b/ext/win32ole/extconf.rb
@@ -12,16 +12,6 @@ end
 
 dir_config("win32", inc, lib)
 
-SRCFILES=<<SRC
-win32ole.c
-SRC
-
-def create_docfile(src)
-  open(File.expand_path($srcdir) + "/.document", "w") {|ofs|
-    ofs.print src
-  }
-end
-
 def create_win32ole_makefile
   if have_library("ole32") and
      have_library("oleaut32") and
@@ -34,9 +24,6 @@ def create_win32ole_makefile
       have_type("IMultiLanguage", "mlang.h")
     end
     create_makefile("win32ole")
-    create_docfile(SRCFILES)
-  else
-    create_docfile("")
   end
 end