diff --git a/ChangeLog b/ChangeLog
index 83dec55265..cfed50237e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu May  6 12:12:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* README: update.
+
 Thu May  6 03:34:29 2010  Koichi Sasada  <ko1@atdot.net>
 
 	* cont.c: apply FIBER_USE_NATIVE patch.  This patch improve
diff --git a/README b/README
index 7e8370ec59..3d2e636e4d 100644
--- a/README
+++ b/README
@@ -89,6 +89,32 @@ This is what you need to do to compile and install Ruby:
 
   7. Run 'make install'
 
+     This command will create following directories and install files
+     onto them.
+
+       * ${DESTDIR}${prefix}/bin
+       * ${DESTDIR}${prefix}/include/ruby-${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/include/ruby-${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib
+       * ${DESTDIR}${prefix}/lib/ruby
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/gems/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/share/man/man1
+       * ${DESTDIR}${prefix}/share/ri/${MAJOR}.${MINOR}.${TEENY}/system
+
+     If Ruby's API version is `x.y.z', the ((|${MAJOR}|)) is `x', the
+     ((|${MINOR}|)) is `y', and the ((|${TEENY}|)) is `z'.
+
+     NOTE: teeny of the API version may be different from one of
+     Ruby's program version
+
      You may have to be a super user to install ruby.
 
 If you fail to compile ruby, please send the detailed error report with
diff --git a/README.ja b/README.ja
index 2191720a26..dd7f67ca59 100644
--- a/README.ja
+++ b/README.ja
@@ -116,6 +116,32 @@ Ruby
 
   7. make install
 
+     以下のディレクトリを作って，そこにファイルをインストー
+     ルします．
+
+       * ${DESTDIR}${prefix}/bin
+       * ${DESTDIR}${prefix}/include/ruby-${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/include/ruby-${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib
+       * ${DESTDIR}${prefix}/lib/ruby
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}.${TEENY}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/gems/${MAJOR}.${MINOR}.${TEENY}
+       * ${DESTDIR}${prefix}/share/man/man1
+       * ${DESTDIR}${prefix}/share/ri/${MAJOR}.${MINOR}.${TEENY}/system
+
+     RubyのAPIバージョンが`x.y.z'であれば，((|${MAJOR}|))は
+     `x'で，((|${MINOR}|))は`y'，((|${TEENY}|))は`z'です．
+
+     注意: APIバージョンのteenyは，Rubyプログラムのバージョ
+     ンとは異なることがあります．
+
      rootで作業する必要があるかもしれません．
 
 もし，コンパイル時にエラーが発生した場合にはエラーのログとマ
diff --git a/bcc32/README.bcc32 b/bcc32/README.bcc32
index fb19906c75..cd33eec0a1 100644
--- a/bcc32/README.bcc32
+++ b/bcc32/README.bcc32
@@ -36,6 +36,7 @@
     You can also specify the install directory.
     For example, run `((%configure --prefix=<install_directory>%))'
     Default of the install directory is /usr .
+    The default ((|<PLATFORM>|)) is `(({i386-bccwin32}))'.
      
 (2) Change ((|RUBY_INSTALL_NAME|)) and ((|RUBY_SO_NAME|)) in (({Makefile}))
     if you want to change the name of the executable files. 
@@ -48,19 +49,6 @@
 
 (5) Run `((%make install%))'
 
-    This command will create following directories and install files onto them.
-      * <install_directory>\bin
-      * <install_directory>\lib
-      * <install_directory>\lib\ruby
-      * <install_directory>\lib\ruby\<MAJOR>.<MINOR>
-      * <install_directory>\lib\ruby\<MAJOR>.<MINOR>\<PLATFORM>
-      * <install_directory>\lib\ruby\site_ruby
-      * <install_directory>\lib\ruby\site_ruby\<MAJOR>.<MINOR>
-      * <install_directory>\lib\ruby\site_ruby\<MAJOR>.<MINOR>\<PLATFORM>
-      * <install_directory>\man\man1
-    If Ruby's version is `x.y.z', the ((|<MAJOR>|)) is `x' and the ((|<MINOR>|)) is `y'.
-    The default ((|<PLATFORM>|)) is `(({i386-bccwin32}))'.
-
 (6) Requires dynamic RTL (cc3250.dll on C++Builder5) and borlndmm.dll (If built with
     usebormm.lib) to use installed binary. These files are ordinary in bcc32's bin
     directory.
diff --git a/win32/README.win32 b/win32/README.win32
index 5dd79cd174..423cc0d494 100644
--- a/win32/README.win32
+++ b/win32/README.win32
@@ -35,6 +35,7 @@
     You can also specify the install directory.
     For example, run `((%configure --prefix=<install_directory>%))'
     Default of the install directory is /usr .
+    The default ((|<PLATFORM>|)) is `(({i386-mswin32}))'.
 
 (2) Change ((|RUBY_INSTALL_NAME|)) and ((|RUBY_SO_NAME|)) in (({Makefile}))
     if you want to change the name of the executable files. 
@@ -47,19 +48,6 @@
 
 (5) Run `((%nmake install%))'
 
-    This command will create following directories and install files onto them.
-      * <install_directory>\bin
-      * <install_directory>\lib
-      * <install_directory>\lib\ruby
-      * <install_directory>\lib\ruby\<MAJOR>.<MINOR>
-      * <install_directory>\lib\ruby\<MAJOR>.<MINOR>\<PLATFORM>
-      * <install_directory>\lib\ruby\site_ruby
-      * <install_directory>\lib\ruby\site_ruby\<MAJOR>.<MINOR>
-      * <install_directory>\lib\ruby\site_ruby\<MAJOR>.<MINOR>\<PLATFORM>
-      * <install_directory>\man\man1
-    If Ruby's version is `x.y.z', the ((|<MAJOR>|)) is `x' and the ((|<MINOR>|)) is `y'.
-    The default ((|<PLATFORM>|)) is `(({i386-mswin32}))'.
-
 == Icons
 
 Any icon files(*.ico) in the build directory, directories specified with