diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 70d62b11e97..ee066861dfa 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -2561,7 +2561,7 @@ en:
         warn_local_payload_url: "It seems you are trying to set up the webhook to a local url. Event delivered to a local address may cause side-effect or unexpected behaviours. Continue?"
         secret_invalid: "Secret must not have any blank characters."
         secret_too_short: "Secret should be at least 12 characters."
-        secret_placeholder: "A optional string, used for generating signature"
+        secret_placeholder: "An optional string, used for generating signature"
         event_type_missing: "You need to set up at least one event type."
         content_type: "Content Type"
         secret: "Secret"