diff --git a/plugins/Recaptcha/RecaptchaPlugin.php b/plugins/Recaptcha/RecaptchaPlugin.php
index d0932efe22..73a2dcc76a 100644
--- a/plugins/Recaptcha/RecaptchaPlugin.php
+++ b/plugins/Recaptcha/RecaptchaPlugin.php
@@ -54,6 +54,7 @@ class RecaptchaPlugin extends Plugin
     function onEndRegistrationFormData($action)
     {
         $action->elementStart('li');
+        // TRANS: Field label.
         $action->raw('<label for="recaptcha">'._m('Captcha').'</label>');
 
         // AJAX API will fill this div out.