diff --git a/protocols.csv b/protocols.csv
index 2b6eed9..257e063 100644
--- a/protocols.csv
+++ b/protocols.csv
@@ -40,3 +40,4 @@ code,	size,	name,	comment
 281, 	0,	webrtc, webrtc transport where connection establishment is according to w3c spec
 290,	0,	p2p-circuit,
 777,	V, memory, in memory transport for self-dialing and testing; arbitrary
+9849,	V,	ech, ECHConfigList per RFC 9849
diff --git a/protocols/ech.md b/protocols/ech.md
new file mode 100644
index 0000000..29d0f44
--- /dev/null
+++ b/protocols/ech.md
@@ -0,0 +1,11 @@
+# ech
+
+This protocol encodes a server's ECHConfigList as defined in [RFC
+9849](https://www.rfc-editor.org/info/rfc9849/).
+
+Its binary representation is the length prefixed bytes of the ECHConfigList.
+Its string representation is the multibase encoding bytes of the ECHConfigList.
+
+## Usage
+
+`/ech` should be appended directly after `/tls` or `/quic-v1`.