diff --git a/sql/hlr.sql b/sql/hlr.sql
index 9b8156e..041b42b 100644
--- a/sql/hlr.sql
+++ b/sql/hlr.sql
@@ -32,6 +32,8 @@
 	-- Chapter 2.1.8
 	lmsi		INTEGER,
 
+	-- The below purged flags might not even be stored non-volatile,
+	-- refer to TS 23.012 Chapter 3.6.1.4
 	-- Chapter 2.7.5
 	ms_purged_cs	BOOLEAN NOT NULL DEFAULT 0,
 	-- Chapter 2.7.6