diff --git a/howto/apache_webserver_rewrite.txt b/howto/apache_webserver_rewrite.txt
index 0a1e94a..8c24e82 100644
--- a/howto/apache_webserver_rewrite.txt
+++ b/howto/apache_webserver_rewrite.txt
@@ -26,3 +26,14 @@ To simple forward your request to your internal server2 on port 8080:
 
   RewriteEngine On
   RewriteRule ^/app/(.*)$ http://server2:8080/app1/$1 [P]
+
+The website semalt.com is spamming us with referers that actually don't exsists.
+To clean you statistics and send the basterts back to where they came from: 
+
+  # Block semalt.com referer
+  RewriteEngine on
+  RewriteCond %{HTTP_REFERER} semalt\.com [NC,OR]
+  RewriteCond %{HTTP_REFERER} ^http://([^.]+\.)*semalt\.com [NC,OR]
+  RewriteCond %{HTTP_REFERER} ^http://([^.]+\.)*kambasoft\.com [NC,OR]
+  RewriteCond %{HTTP_REFERER} youtube-downloader\.savetubevideo\.com [NC]
+  RewriteRule (.*) http://www.semalt.com [R=301,L]