diff --git a/models/site.rb b/models/site.rb
index 22cc4a95..e8b456b2 100644
--- a/models/site.rb
+++ b/models/site.rb
@@ -42,14 +42,15 @@ class Site < Sequel::Model
     application/epub+zip
     message/rfc822
     application/font-sfnt
+    application/opensearchdescription+xml
   }
 
   VALID_EXTENSIONS = %w{
-    html htm txt text css js jpg jpeg png apng gif svg md markdown eot ttf woff woff2 json geojson csv tsv mf ico pdf asc key pgp xml mid midi manifest otf webapp less sass rss kml dae obj mtl scss webp avif xcf epub gltf bin webmanifest knowl atom opml rdf map gpg resolveHandle pls yaml yml toml
+    html htm txt text css js jpg jpeg png apng gif svg md markdown eot ttf woff woff2 json geojson csv tsv mf ico pdf asc key pgp xml mid midi manifest otf webapp less sass rss kml dae obj mtl scss webp avif xcf epub gltf bin webmanifest knowl atom opml rdf map gpg resolveHandle pls yaml yml toml osdx
   }
 
   VALID_EDITABLE_EXTENSIONS = %w{
-    html htm txt js css scss md manifest less webmanifest xml json opml rdf svg gpg pgp resolveHandle pls yaml yml toml
+    html htm txt js css scss md manifest less webmanifest xml json opml rdf svg gpg pgp resolveHandle pls yaml yml toml osdx
   }
 
   MINIMUM_PASSWORD_LENGTH = 5