diff --git a/model/ddl.sql b/model/ddl.sql
index 5c98cbd..14a4ae6 100644
--- a/model/ddl.sql
+++ b/model/ddl.sql
@@ -148,7 +148,7 @@ CREATE TABLE PUBLIC.MEASUREMENT (
     TYPE SMALLINT NOT NULL DEFAULT -1,       -- 要按电力元素的类型（包含可能的结构体类型）来展开
     SIZE INTEGER NOT NULL DEFAULT -1,
     DATA_SOURCE JSONB NOT NULL DEFAULT '{}', -- http://server.baseware.net:6875/books/product-design-docs/page/7eacb
-    EVENT_PLAN JSONB NOT NULL DEFAULT '{}',
+    EVENT_PLAN JSONB NOT NULL DEFAULT '{}',  -- http://server.baseware.net:6875/books/product-design-docs/page/02522
     BAY_UUID UUID NOT NULL,
     COMPONENT_UUID UUID NOT NULL,
     OP INTEGER NOT NULL DEFAULT -1,