diff --git a/unicodetools/data/ucd/dev/PropList.txt b/unicodetools/data/ucd/dev/PropList.txt
index fae2831e7..f1272843e 100644
--- a/unicodetools/data/ucd/dev/PropList.txt
+++ b/unicodetools/data/ucd/dev/PropList.txt
@@ -1,3 +1,4 @@
+1DFF5..1DFF9; Other_Lowercase
 # PropList-16.0.0.txt
 # Date: 2024-05-31, 18:09:48 GMT
 # © 2024 Unicode®, Inc.