diff --git a/types/image.yaml b/types/image.yaml
index 0e034da..5ea8558 100644
--- a/types/image.yaml
+++ b/types/image.yaml
@@ -347,6 +347,8 @@
 - !ruby/object:MIME::Type
   content-type: image/jxl
   encoding: base64
+  extensions:
+    - jxl
   xrefs:
     person:
     - ISO-IEC_JTC_1