diff --git a/src/locales/en-US.json b/src/locales/en-US.json
index 54f726a..538b46e 100644
--- a/src/locales/en-US.json
+++ b/src/locales/en-US.json
@@ -41,6 +41,7 @@
       "invalidValue": "Invalid value",
       "lengthMustBeBetween": "Length must be between %{min} – %{max} characters",
       "mustBeAtLeast": "Must be at least %{value}",
+      "optional": "optional",
       "passwordsDoNotMatch": "Passwords do not match",
       "required": "Required",
       "search": "Search",