README.adoc in metanorma-0.3.8 vs README.adoc in metanorma-0.3.9

@@ -142,9 +142,10 @@
   -w, --wrapper                    Create wrapper folder for HTML output
   -d, --data-uri-image             Encode HTML output images as data URIs
   -a, --asciimath                  Preserve AsciiMath in Metanorma XML, instead of transforming it into MathML
   -R, --relaton FILENAME           Export Relaton XML (bibdata) for this document to FILENAME
       (Also triggered through -x rxl)
+  -S, --sourcecode DIR             Export sourcecode fragments from this document to directory DIR
   -h, --help                       Show this message
 ----
 
 Basically it is used like this: