diff --git a/phpBB/adm/style/captcha_recaptcha.html b/phpBB/adm/style/captcha_recaptcha.html
index 3f61c76cb1..563bd98835 100644
--- a/phpBB/adm/style/captcha_recaptcha.html
+++ b/phpBB/adm/style/captcha_recaptcha.html
@@ -5,8 +5,9 @@
 		<div>{L_RECAPTCHA_NOSCRIPT}</div>
 	</noscript>
 
+		{L_RECAPTCHA_INVISIBLE}
 		<script src="{RECAPTCHA_SERVER}.js?hl={LA_RECAPTCHA_LANG}" async defer></script>
-		<div class="g-recaptcha" data-sitekey="{RECAPTCHA_PUBKEY}"></div>
+		<div class="g-recaptcha" data-sitekey="{RECAPTCHA_PUBKEY}" data-size="invisible"></div>
 	</dd>
 	</dl>
 <!-- ELSE -->
diff --git a/phpBB/language/en/captcha_recaptcha.php b/phpBB/language/en/captcha_recaptcha.php
index dde2a4ba08..db28820747 100644
--- a/phpBB/language/en/captcha_recaptcha.php
+++ b/phpBB/language/en/captcha_recaptcha.php
@@ -43,10 +43,10 @@ $lang = array_merge($lang, array(
 	'RECAPTCHA_INCORRECT'			=> 'The solution you provided was incorrect',
 	'RECAPTCHA_NOSCRIPT'			=> 'Please enable JavaScript in your browser to load the challenge.',
 
-	'RECAPTCHA_PUBLIC'				=> 'Public reCaptcha key',
-	'RECAPTCHA_PUBLIC_EXPLAIN'		=> 'Your public reCaptcha key. Keys can be obtained on <a href="http://www.google.com/recaptcha">www.google.com/recaptcha</a>.',
-	'RECAPTCHA_PRIVATE'				=> 'Private reCaptcha key',
-	'RECAPTCHA_PRIVATE_EXPLAIN'		=> 'Your private reCaptcha key. Keys can be obtained on <a href="http://www.google.com/recaptcha">www.google.com/recaptcha</a>.',
+	'RECAPTCHA_PUBLIC'				=> 'Site key',
+	'RECAPTCHA_PUBLIC_EXPLAIN'		=> 'Your site reCAPTCHA key. Keys can be obtained on <a href="http://www.google.com/recaptcha">www.google.com/recaptcha</a>. Please, use Invisible reCAPTCHA type.',
+	'RECAPTCHA_PRIVATE'				=> 'Secret key',
+	'RECAPTCHA_PRIVATE_EXPLAIN'		=> 'Your secret reCAPTCHA key. Keys can be obtained on <a href="http://www.google.com/recaptcha">www.google.com/recaptcha</a>. Please, use Invisible reCAPTCHA type.',
 
-	'RECAPTCHA_EXPLAIN'				=> 'In an effort to prevent automatic submissions, we require that you complete the following challenge.',
+	'RECAPTCHA_INVISIBLE'			=> 'This CAPTCHA is actually invisible. To verify that it works, a small icon should appear in right bottom corner of this page.',
 ));