diff --git a/app/naszepopowice.hs b/app/naszepopowice.hs
index 0e3f567..b562e3f 100644
--- a/app/naszepopowice.hs
+++ b/app/naszepopowice.hs
@@ -27,7 +27,7 @@ replaceSeparatorWithSpace = map (\c -> if c=='_' then ' '; else if c=='-' then '
 replaceUnderscoreWithDash = map (\c -> if c=='_' then '-'; else c)
 
 getNr url =
-  case url =~~ "nr[-_][0-9][0-9]" :: Maybe String of
+  case url =~~ "nr[-_][0-9][0-9](_cz-[0-9])?" :: Maybe String of
     Just nr -> replaceSeparatorWithSpace nr
     otherwise -> error $ "unexpected url: " ++ url