diff --git a/ChangeLog b/ChangeLog
index 403e3572b7..0fedd48f29 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu May  6 12:12:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* README: update.
+
 Wed May  5 19:00:01 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/extconf.rb: revert. enbugged by last commit.
diff --git a/README b/README
index 1b79781367..6c0fff6537 100644
--- a/README
+++ b/README
@@ -93,6 +93,25 @@ 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}/lib
+       * ${DESTDIR}${prefix}/lib/ruby
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}/${PLATFORM}
+       * ${DESTDIR}${prefix}/share/man/man1
+
+     If Ruby's version is `x.y.z', the ((|${MAJOR}|)) is `x' and the
+     ((|${MINOR}|)) is `y'.
+
      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 1eeb8eac52..4ad8a97be3 100644
--- a/README.ja
+++ b/README.ja
@@ -120,6 +120,28 @@ 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}/lib
+       * ${DESTDIR}${prefix}/lib/ruby
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}
+       * ${DESTDIR}${prefix}/lib/ruby/${MAJOR}.${MINOR}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}
+       * ${DESTDIR}${prefix}/lib/ruby/site_ruby/${MAJOR}.${MINOR}/${PLATFORM}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}
+       * ${DESTDIR}${prefix}/lib/ruby/vendor_ruby/${MAJOR}.${MINOR}/${PLATFORM}
+       * ${DESTDIR}${prefix}/share/man/man1
+
+     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 c27a1261f1..1ce9a23c17 100644
--- a/bcc32/README.bcc32
+++ b/bcc32/README.bcc32
@@ -30,7 +30,13 @@
 == How to compile and install
 
 (1) Execute bcc32\configure.bat on your build directory.
-     ex. c:\ruby-1.6.7>bcc32\configure.bat
+     ex. c:\ruby-1.8.8> bcc32\configure.bat
+    You can specify the target platform as an argument.
+    For example, run `((%configure i686-bccwin32%))'
+    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. 
@@ -41,20 +47,7 @@
 
 (4) Run `((%make test%))'
 
-(5) Run `((%make DESTDIR=<install_directory> 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 ((|<PLATFORM>|)) is usually `(({i586-bccwin32}))'.
+(5) Run `((%make install%))'
 
 (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
@@ -90,10 +83,10 @@ in Japanese, but you can download at least.
 
     C:
     cd \ruby
-    bcc32\configure
+    bcc32\configure --prefix=/usr/local
     make
     make test
-    make DESTDIR=/usr/local install
+    make install
 
 * Build on the relative directory from the ruby source directory and CPU type 
   i386.
@@ -108,10 +101,10 @@ in Japanese, but you can download at least.
     cd \ruby
     mkdir bccwin32
     cd bccwin32
-    ..\bcc32\configure target i386-bccwin32
+    ..\bcc32\configure --prefix=/usr/local
     make
     make test
-    make DESTDIR=/usr/local install
+    make install
 
 * Build on the different drive.
 
@@ -122,10 +115,10 @@ in Japanese, but you can download at least.
 
     D:
     cd D:\build\ruby
-    C:\src\ruby\bcc32\configure
+    C:\src\ruby\bcc32\configure --prefix=C:/usr/local
     make
     make test
-    make DESTDIR=C:/usr/local install
+    make install
 
 == Bugs
 
diff --git a/version.h b/version.h
index bb8e9b888e..cb04779f9e 100644
--- a/version.h
+++ b/version.h
@@ -1,7 +1,7 @@
 #define RUBY_VERSION "1.8.8"
-#define RUBY_RELEASE_DATE "2010-05-05"
+#define RUBY_RELEASE_DATE "2010-05-06"
 #define RUBY_VERSION_CODE 188
-#define RUBY_RELEASE_CODE 20100505
+#define RUBY_RELEASE_CODE 20100506
 #define RUBY_PATCHLEVEL -1
 
 #define RUBY_VERSION_MAJOR 1
@@ -9,7 +9,7 @@
 #define RUBY_VERSION_TEENY 8
 #define RUBY_RELEASE_YEAR 2010
 #define RUBY_RELEASE_MONTH 5
-#define RUBY_RELEASE_DAY 5
+#define RUBY_RELEASE_DAY 6
 
 #define NO_STRING_LITERAL_CONCATENATION 1
 #ifdef RUBY_EXTERN
diff --git a/win32/README.win32 b/win32/README.win32
index e7d589759c..cc4081ab29 100644
--- a/win32/README.win32
+++ b/win32/README.win32
@@ -4,7 +4,7 @@
 
 == Requirement
 
-(1) Visual C++ 5.0 or later.
+(1) Visual C++ 6.0 or later.
 
 (2) If you want to run `((%nmake clean%))' or `((%nmake distclean%))'
     properly, you must install UNIX compatible `((%rm%))' command on
@@ -24,6 +24,10 @@
 (1) Execute win32\configure.bat on your build directory.
     You can specify the target platform as an argument.
     For example, run `((%configure i686-mswin32%))'
+    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. 
@@ -38,19 +42,6 @@
 
 (6) Run `((%nmake DESTDIR=<install_directory> 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