diff --git a/data/tld-!cn b/data/tld-!cn
index 05d04370..57247085 100644
--- a/data/tld-!cn
+++ b/data/tld-!cn
@@ -1,4 +1,24 @@
-# ref https://www.101domain.com/branded_domains.htm
+# References:
+# https://icannwiki.org/Country_code_top-level_domain
+# https://www.101domain.com/branded_domains.htm
+
+# ccTLD
+au # Australia
+br # Brazil
+ca # Canada
+de # Germany
+eu # European Union
+fr # France
+hk # Hong Kong
+jp # Japan
+mo # Macau
+nz # New Zealand
+ru # Russia
+sg # Singapore
+tw # Taiwan
+uk # United Kingdom
+us # United States
+vn # Vietnam
 
 # Athletics Domains
 afl # Australian Football League