diff --git a/plugins/SitesManager/SitesManager.php b/plugins/SitesManager/SitesManager.php
index ca3f2757b93cf1305a7966cb0df570e987dacf83..5ebc5898f6df3152c17a07af64d944005cad9bc3 100644
--- a/plugins/SitesManager/SitesManager.php
+++ b/plugins/SitesManager/SitesManager.php
@@ -293,6 +293,7 @@ class SitesManager extends \Piwik\Plugin
         $translationKeys[] = "SitesManager_AliasUrlHelp";
         $translationKeys[] = "SitesManager_OnlyMatchedUrlsAllowed";
         $translationKeys[] = "SitesManager_OnlyMatchedUrlsAllowedHelp";
+        $translationKeys[] = "SitesManager_OnlyMatchedUrlsAllowedHelpExamples";
         $translationKeys[] = "SitesManager_KeepURLFragmentsLong";
         $translationKeys[] = "SitesManager_HelpExcludedIps";
         $translationKeys[] = "SitesManager_ListOfQueryParametersToExclude";
diff --git a/plugins/SitesManager/lang/en.json b/plugins/SitesManager/lang/en.json
index 0916869ce0181d5fb60fa0afd59710dd92ac0738..c566f9d40c4291ddce062d7a8348459f50980138 100644
--- a/plugins/SitesManager/lang/en.json
+++ b/plugins/SitesManager/lang/en.json
@@ -78,6 +78,7 @@
         "UTCTimeIs": "UTC time is %s.",
         "OnlyMatchedUrlsAllowed": "Only track visits and actions when the action URL starts with one of the above URLs.",
         "OnlyMatchedUrlsAllowedHelp": "When enabled, Piwik will only track internal actions when the Page URL is one of the known URLs for your website. This prevents people from spamming your analytics with URLs for other websites.",
+        "OnlyMatchedUrlsAllowedHelpExamples": "The domain and the path has to be an exact match and each valid subdomain has to be specified separately. For example when the known URLs are 'http://example.com/path' and 'http://good.example.com', tracking requests for 'http://example.com/otherpath' or 'http://bad.example.com' are ignored.",
         "WebsitesManagement": "Websites Management",
         "XManagement": "Manage %s",
         "ChooseMeasurableTypeHeadline": "What would you like to measure?",
diff --git a/plugins/SitesManager/templates/sites-list/site-fields.html b/plugins/SitesManager/templates/sites-list/site-fields.html
index dada85cc225cb49be691ba4123e3205adb31482b..200e935e270d3379a03b993565f33271acba436a 100644
--- a/plugins/SitesManager/templates/sites-list/site-fields.html
+++ b/plugins/SitesManager/templates/sites-list/site-fields.html
@@ -85,6 +85,7 @@
 
             <div class="form-help">
                 {{ 'SitesManager_OnlyMatchedUrlsAllowedHelp' | translate }}
+                {{ 'SitesManager_OnlyMatchedUrlsAllowedHelpExamples' | translate }}
             </div>
             <label class="checkbox">
                 <input type="checkbox" ng-model="site.exclude_unknown_urls" ng-true-value="1" ng-false-value="0"> {{ 'SitesManager_OnlyMatchedUrlsAllowed' | translate:'':'' }}