diff --git a/FUNDING.yml b/FUNDING.yml
new file mode 100644
index 0000000..aba653b
--- /dev/null
+++ b/FUNDING.yml
@@ -0,0 +1,9 @@
+custom:
+    # PayPal donation button is superior to a paypal.me link because it
+    # additionally:
+    #   - accepts credit cards without a need to create a PayPal account
+    #   - allows monthly subscriptions (requires a PayPal account)
+    # However, the URL is rather lengthy and GitHub shows it in full in the
+    # Sponsor modal popup.
+  - https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=9HJHAH5UDL3GL
+