diff --git a/README.md b/README.md
index 5b1b434..04eb2b8 100644
--- a/README.md
+++ b/README.md
@@ -14,4 +14,6 @@ Command line options:
 
 -css_inline (true/false) If you are going to import html document on a web site it is better to use inline styles.
 
+-rdf for RDF as a target format
+
 -csv_metadata path_to_csv_file with metadata for RDF export