diff --git a/readme.md b/readme.md
index 3ef08e5..1122677 100644
--- a/readme.md
+++ b/readme.md
@@ -1,5 +1,5 @@
 
-Xbyak 5.432 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++
+Xbyak 5.50 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++
 =============
 
 Abstract
diff --git a/readme.txt b/readme.txt
index c93f975..4f7cb2e 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,5 +1,5 @@
 
-    C++用x86(IA-32), x64(AMD64, x86-64) JITアセンブラ Xbyak 5.432
+    C++用x86(IA-32), x64(AMD64, x86-64) JITアセンブラ Xbyak 5.50
 
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 ◎概要
@@ -343,7 +343,9 @@
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 ◎履歴
 
-2017/07/12 ver 5.432 PVS-studioの警告を減らす
+2017/08/08 ver 5.50 mpx追加(thanks to magurosan)
+2017/08/08 ver 5.45 sha追加(thanks to magurosan)
+2017/08/08 ver 5.44 prefetchw追加(thanks to rsdubtso)
 2017/07/09 ver 5.431 hasRex()修正 (影響なし) (thanks to drillsar)
 2017/05/14 ver 5.43 CodeGenerator::resetSize()修正(thanks to gibbed)
 2017/05/13 ver 5.42 movs{b,w,d,q}追加