diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..ab068f8
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,5 @@
+# This is a comment.
+# Each line is a file pattern followed by one or more owners.
+
+*       @vvakame
+*.yml   @vvakame @mhidaka
diff --git a/languages/ja/typo.yml b/languages/ja/typo.yml
index e365893..d500e71 100644
--- a/languages/ja/typo.yml
+++ b/languages/ja/typo.yml
@@ -1,8 +1,5 @@
 # Rules for Japanese typo
 meta:
-  reviewer:
-    - vvakame
-    - mhidaka
   rules:   https://github.com/prh/rules
 
 version: 1
diff --git a/media/WEB+DB_PRESS.yml b/media/WEB+DB_PRESS.yml
index f5bf38e..5f90bbb 100644
--- a/media/WEB+DB_PRESS.yml
+++ b/media/WEB+DB_PRESS.yml
@@ -1,8 +1,5 @@
 # Rules for WEB+DB PRESS
 meta:
-  reviewer:
-    - vvakame
-    - mhidaka
   related: http://gihyo.jp/magazine/wdpress
   rules:   https://github.com/prh/rules
 
diff --git a/media/techbooster.yml b/media/techbooster.yml
index 608b8c0..e2c27ce 100644
--- a/media/techbooster.yml
+++ b/media/techbooster.yml
@@ -1,8 +1,5 @@
 # Rules for TechBooster
 meta:
-  reviewer:
-    - vvakame
-    - mhidaka
   related: http://techbooster.org/
   rules:   https://github.com/prh/rules
 
diff --git a/terms/android.yml b/terms/android.yml
index cc27fda..86cb3f0 100644
--- a/terms/android.yml
+++ b/terms/android.yml
@@ -1,8 +1,5 @@
 # Rules for Android
 meta:
-  reviewer:
-    - vvakame
-    - mhidaka
   related: https://www.android.com/ 
   rules:   https://github.com/prh/rules
 
diff --git a/terms/javascript.yml b/terms/javascript.yml
index c790baa..875f8c4 100644
--- a/terms/javascript.yml
+++ b/terms/javascript.yml
@@ -1,7 +1,5 @@
 # Rules for JavaScript
 meta:
-  reviewer:
-    - vvakame
   related: http://www.ecma-international.org/publications/standards/Ecma-262.htm 
   rules:   https://github.com/prh/rules
 
diff --git a/terms/software.yml b/terms/software.yml
index e352923..face972 100644
--- a/terms/software.yml
+++ b/terms/software.yml
@@ -1,8 +1,5 @@
 # Rules for Software Development
 meta:
-  reviewer:
-    - vvakame
-    - mhidaka
   rules:   https://github.com/prh/rules
 
 version: 1
diff --git a/terms/trademark.yml b/terms/trademark.yml
index 98d3593..dfab745 100644
--- a/terms/trademark.yml
+++ b/terms/trademark.yml
@@ -1,8 +1,5 @@
 # Rules for Trademark
 meta:
-  reviewer:
-    - vvakame
-    - mhidaka
   rules:   https://github.com/prh/rules
 
 version: 1
@@ -26,10 +23,3 @@ rules:
       - アメリカン・エキスプレス
       - アメックス
       - アメリカンエクスプレス
-  - expected: 技術書典
-    pattern:  /技術書(店|…|点|展|てん)/
-    specs:
-      - from: 技術書点
-        to:   技術書典
-      - from: 技術書展
-        to:   技術書典