diff --git a/_metadata.yml b/_metadata.yml
index 71ed514..f47740e 100644
--- a/_metadata.yml
+++ b/_metadata.yml
@@ -79,7 +79,22 @@ crossref:
       latex-env: req
       latex-list-of-file-extension: lost
       latex-list-of-description: Revision Equation
-
+    - kind: float
+      key: efg
+      reference-prefix: "Extended Data Fig."
+      space-before-numbering: true
+      caption-prefix: "Extended Data Fig."
+      latex-env: efg
+      latex-list-of-file-extension: lost
+      latex-list-of-description: Extended Data Figure
+    - kind: float
+      key: etb
+      reference-prefix: "Extended Data Table"
+      space-before-numbering: true
+      caption-prefix: "Extended Data Table"
+      latex-env: etb
+      latex-list-of-file-extension: lost
+      latex-list-of-description: Extended Data Table
 website:
   title: "{{< var reponame >}}: {{< var branch >}}"
   reader-mode: true