diff --git a/README b/README
index 5f82f94b8..d5e75b154 100644
--- a/README
+++ b/README
@@ -523,7 +523,8 @@ Options affecting specific writers
 :   Use the specified file as a style reference in producing a docx file.
     For best results, the reference docx should be a modified version
     of a docx file produced using pandoc.  The contents of the reference docx
-    are ignored, but its stylesheets are used in the new docx. If no
+    are ignored, but its stylesheets and document properties (including
+    margins, page size, header, and footer) are used in the new docx. If no
     reference docx is specified on the command line, pandoc will look
     for a file `reference.docx` in the user data directory (see
     `--data-dir`). If this is not found either, sensible defaults will be