diff --git a/README.md b/README.md
index b3e8a3f..efe473a 100644
--- a/README.md
+++ b/README.md
@@ -195,6 +195,12 @@ If a property is imported from the file/object itself, it is
 recommended to mark it as such via the granular marking, see X for more
 info on how to do this.
 
+The additional properties can be considered the [RDF-MT]
+s-p-o (subject-predicate-object) triple, where the subject one of (each
+of) hashes, the predicate is "has", and the object is another s-p-o
+triple, which is (the property name, "is", property value).  (Use "be"
+instead of "is"?)
+
 Open Questions:  When meta data is "declassified", how do you maintain
 a link to the classified version?
 
@@ -352,3 +358,5 @@ Reference Info:
 
 https://wiki.freedesktop.org/www/CommonExtendedAttributes/ Dublin Core reference by Freedesktop
 https://help.archive.org/hc/en-us/articles/360018818271-Internet-Archive-Metadata
+
+[RDF-MT]: https://www.w3.org/TR/rdf11-mt/