diff --git a/README.md b/README.md
index 4ec9ae830624817143615bff4230967cb9e470f2..2fd23da27e213bf18dbea07fa6c7773c5a610012 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Zig bindings for the Unicode Character Database
 
 Last updated as of Unicode 13.0.0
 
+http://www.unicode.org/reports/tr44/
+
 https://www.unicode.org/versions/latest/
 
 https://unicode.org/Public/UCD/latest/ucd/