diff --git a/robots.txt b/robots.txt
index 709a9b6..13cbeab 100644
--- a/robots.txt
+++ b/robots.txt
@@ -4,3 +4,4 @@ Disallow: /go/
 Disallow: /forum/index.php?action=profile;*
 Disallow: /forum/index.php?topic=*.from*
 Disallow: /forum/index.php?topic=*.msg*
+Disallow: /forum/index.php?board=*;filter=*