diff --git a/admin_manual/configuration/config_sample_php_parameters.rst b/admin_manual/configuration/config_sample_php_parameters.rst
index d08ae3e19..58d1e6195 100644
--- a/admin_manual/configuration/config_sample_php_parameters.rst
+++ b/admin_manual/configuration/config_sample_php_parameters.rst
@@ -967,3 +967,10 @@ Available:
 		"font-src 'self' data:; media-src *",
 
 Custom CSP policy, changing this will overwrite the standard policy
+
+::
+
+	'secret' => 'ICertainlyShouldHaveChangedTheDefaultSecret',
+
+Secret used by ownCloud for various purposes, e.g. to encrypt data. If you
+lose this string there will be data corruption.