diff --git a/_i18n/ja.json b/_i18n/ja.json
index b1afd02d..01c8f8da 100644
--- a/_i18n/ja.json
+++ b/_i18n/ja.json
@@ -3,12 +3,12 @@
     "GLOSSARY": "用語集",
     "GLOSSARY_INDEX": "索引",
     "GLOSSARY_OPEN": "用語集",
-    "GITBOOK_LINK": "GitBookで公開 ",
+    "GITBOOK_LINK": "GitBookにより発行",
     "SUMMARY": "目次",
     "SUMMARY_INTRODUCTION": "はじめに",
     "SUMMARY_TOGGLE": "目次",
     "SEARCH_TOGGLE": "検索",
-    "SEARCH_PLACEHOLDER": "検索すると入力",
+    "SEARCH_PLACEHOLDER": "入力して検索",
     "FONTSETTINGS_TOGGLE": "フォント設定",
     "SHARE_TOGGLE": "シェア",
     "SHARE_ON": "{{platform}}でシェア",