diff --git a/corpora/cmc-corpora/the-online-corpora-of-the-czech-national-corpus.json b/corpora/cmc-corpora/the-online-corpora-of-the-czech-national-corpus.json
index c5fac76..5ce9ac4 100644
--- a/corpora/cmc-corpora/the-online-corpora-of-the-czech-national-corpus.json
+++ b/corpora/cmc-corpora/the-online-corpora-of-the-czech-national-corpus.json
@@ -3,7 +3,7 @@
       "URL": "https://wiki.korpus.cz/doku.php/en:cnk:online",
 	"Family": "Computer-mediated communication corpora",
       "Description": "This is a monitor corpus of the Czech web.\nThe subcorpus <a href=\"https://wiki.korpus.cz/doku.php/en:cnk:online:gen1\">ONLINE1</a> contains texts pertaining to online journalism, social media, discussions, and forums for the period between January 2017 and March 2021. The subcorpora <a href=\"https://wiki.korpus.cz/doku.php/en:cnk:online:gen2\">ONLINE2_Now and ONLINE2_Archive</a> contain journalism texts published until now.\nThe corpus is available via the Czech National Corpus.",
-      "Language": ["cz"],
+      "Language": ["ces"],
       "Licence": "CC BY 4.0",
       "Size": [""],
       "Annotation": ["MSD tagged", "lemmatised"],