diff --git a/crates/serde_urlencoded/RUSTSEC-0000-0000.md b/crates/serde_urlencoded/RUSTSEC-0000-0000.md
new file mode 100644
index 000000000..104df81d6
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+++ b/crates/serde_urlencoded/RUSTSEC-0000-0000.md
@@ -0,0 +1,19 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "serde_urlencoded"
+date = "2016-10-28"
+url = "https://github.com/nox/serde_urlencoded/issues/121"
+informational = "unmaintained"
+
+[versions]
+patched = []
+```
+
+# serde_urlencoded appears to be unmaintained
+
+The `serde_urlencoded` crate appears to be unmaintained.
+
+Alternatives:
+
+- [serde_qs](https://crates.io/crates/serde_qs/)