diff --git a/src/i18n/locales/en.js b/src/i18n/locales/en.js
index 0aff7d0..a1e16e1 100644
--- a/src/i18n/locales/en.js
+++ b/src/i18n/locales/en.js
@@ -51,6 +51,7 @@ const en = {
     show_cardinality: "Show cardinality",
     default_notation: "Default notation",
     crows_foot_notation: "Crow's foot notation",
+    idef1x_notation: "IDEF1X notation",
     notation: "Notation",
     theme: "Theme",
     light: "Light",
diff --git a/src/i18n/locales/es.js b/src/i18n/locales/es.js
index 9df23cd..9f68ec2 100644
--- a/src/i18n/locales/es.js
+++ b/src/i18n/locales/es.js
@@ -52,6 +52,7 @@ const es = {
     notation: "Notación",
     default_notation: "Notación predeterminada",
     crows_foot_notation: "Notación Crow's Foot",
+    idef1x_notation: "Notación IDEF1X",
     theme: "Tema",
     light: "Claro",
     dark: "Oscuro",