diff --git a/RussianFilter/sections/specific.txt b/RussianFilter/sections/specific.txt
index 346883f26d8..4862eb6031b 100644
--- a/RussianFilter/sections/specific.txt
+++ b/RussianFilter/sections/specific.txt
@@ -67,6 +67,7 @@ i.ua###adRead
 mobile-files.com,zx-pk.ru###ad_global_below_navbar
 www.ukr.net###ad_ph_1
 123-box.ru###ad_s
+htfi.ru###slidebox-custom-block
 mf.veut.ru###ad_up_outer
 moeobrazovanie.ru###adapt-wrapper > a[href^="/go/?http"] > img[style]
 nnm.me###adbg