diff --git a/config/config.sample.php b/config/config.sample.php
index c06e39a752b9..522fe1199e38 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -1216,8 +1216,10 @@
 'tempdirectory' => '/tmp/owncloudtemp',
 
 /**
- * The hashing cost used by hashes generated by ownCloud
- * Using a higher value requires more time and CPU power to calculate the hashes
+ * The hashing cost used by hashes generated by ownCloud.
+ * Using a higher value requires more time and CPU power to calculate the hashes.
+ * As this number grows, the amount of work (typically CPU time or memory) necessary
+ * to compute the hash increases exponentially.
  */
 'hashingCost' => 10,
 
@@ -1257,13 +1259,13 @@
 /**
  * The list of apps that are allowed to have no signature.json. Besides
  * ownCloud apps, this is particularly useful when creating ownCloud themes,
- * because themes are treated as apps.
- * The following example allows theme-1 and theme-2 to have no signature.
+ * because themes are treated as apps. The app is identified with it´s app-id. 
+ * The following example allows app-1 and theme-2 to have no signature.
  */
 'integrity.ignore.missing.app.signature' =>
 	array(
-		'theme-1',
-		'theme-2',
+		'app-id of app-1',
+		'app-id of theme-2',
 	),
 
 /**