diff --git a/duckdns/README.md b/duckdns/README.md
new file mode 100644
index 0000000..2c04472
--- /dev/null
+++ b/duckdns/README.md
@@ -0,0 +1,15 @@
+---
+title: DuckDNS (DuckDNS.sh alias)
+homepage: https://webinstall.dev/duckdns.sh
+tagline: |
+  Alias for https://webinstall.dev/duckdns.sh
+alias: duckdns.sh
+description: |
+  See https://webinstall.dev/duckdns.sh
+---
+
+`duckdns` is a reserved installer name.
+
+Currently an alias for <https://webinstall.dev/duckdns.sh>.
+
+That may change in the future.
diff --git a/duckdns/install.sh b/duckdns/install.sh
new file mode 100644
index 0000000..f35e10c
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+++ b/duckdns/install.sh
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+#!/bin/sh
+set -e
+set -u
+
+echo "'duckdns@${WEBI_TAG:-stable}' is reserved for future use."
+echo
+echo "Did you mean 'duckdns.sh@${WEBI_VERSION-}'?"
+WEBI_HOST=${WEBI_HOST:-"https://webi.sh"}
+echo ""
+echo "    curl -fsSL '$WEBI_HOST/duckdns.sh@${WEBI_VERSION-}' | sh"
+exit 1