diff --git a/MitfordODD/Readme.md b/MitfordODD/Readme.md
index e007543..32991aa 100644
--- a/MitfordODD/Readme.md
+++ b/MitfordODD/Readme.md
@@ -10,7 +10,7 @@ To make/edit/update the complete ODD:
       
 * If updating the ODD because of Site Index updates, 
            
-     1) Be sure the new SI is posted at http://digitalmitford.org/si.xml. 
+     1) Be sure the new SI is posted at https://digitalmitford.org/si.xml. 
             
      1) Generate elementSpecs for new named entity markup (persons, places, titles, etc) with attribute values for @ref and @corresp 
       by running si-to-ODD.xsl over the current si.xml stored at http://digitalmitford.org/si.xml. Save the output file as MRMProsopRef.odd