Apply suggestion from @nabenabe0928

y0z · nabenabe0928 · web-flow · commit cc26669040b0 · 2025-10-08T12:37:57.000+09:00
Co-authored-by: Shuhei Watanabe &lt;47781922+nabenabe0928@users.noreply.github.com&gt;
diff --git a/CITATION.cff b/CITATION.cff
@@ -3,6 +3,7 @@ authors:
   - name: Preferred Networks, Inc.
 title: "OptunaHub: A Platform for Black-Box Optimization"
 url: "https://github.com/optuna/optunahub"
+license: "MIT"
 preferred-citation:
   type: article
   authors:
