diff --git a/i18n/ja.yaml b/i18n/ja.yaml
index 30b412d..c286ef9 100644
--- a/i18n/ja.yaml
+++ b/i18n/ja.yaml
@@ -3,3 +3,14 @@
 
 - id: next_page
   translation: "次のページ"
+
+- id: read_time
+  translation:
+    one : "1 分"
+    other: "{{ .Count }} 分"
+
+- id: toc
+  translation: "目次"
+
+- id: translations
+  translation: "言語"