diff --git a/src/file/paragraph/properties.ts b/src/file/paragraph/properties.ts
index 515d626b0c..8b09819233 100644
--- a/src/file/paragraph/properties.ts
+++ b/src/file/paragraph/properties.ts
@@ -1,4 +1,5 @@
 // http://officeopenxml.com/WPparagraphProperties.php
+// https://c-rex.net/projects/samples/ooxml/e1/Part4/OOXML_P4_DOCX_suppressLineNumbers_topic_ID0ECJAO.html
 import { IContext, IgnoreIfEmptyXmlComponent, IXmlableObject, OnOffElement, XmlComponent } from "file/xml-components";
 import { DocumentWrapper } from "../document-wrapper";
 import { IShadingAttributesProperties, Shading } from "../shading";