diff --git a/lib/metanorma/rsd/processor.rb b/lib/metanorma/rsd/processor.rb
index f4adcf9..860f6bb 100644
--- a/lib/metanorma/rsd/processor.rb
+++ b/lib/metanorma/rsd/processor.rb
@@ -16,6 +16,10 @@ def output_formats
         }
       end
 
+      def version
+        "Asciidoctor::Rsd #{Asciidoctor::Rsd::VERSION}"
+      end
+
       def input_to_isodoc(file)
         Metanorma::Input::Asciidoc.new.process(file, @asciidoctor_backend)
       end
@@ -29,4 +33,4 @@ def output(isodoc_node, outname, format, options={})
 
     end
   end
-end
\ No newline at end of file
+end