tlstunnel.1.scd | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tlstunnel.1.scd b/tlstunnel.1.scd
index b692ee9..345429e 100644
--- a/tlstunnel.1.scd+++ b/tlstunnel.1.scd
@@ -78,6 +78,11 @@ The following directives are supported:
The email address to use when creating or selecting an existing ACME
+# NOTES++HTTP/2 requires using the PROXY protocol and the backend must support PROXY+v2's ALPN TLV, since HTTP/2 is negociated that way.
Even with PROXY enabled and ALPN TLVs picked up by the backend, it's
not enough to enable HTTP/2. tlstunnel also needs to advertise HTTP/2
in the TLS ALPN extension, and that work isn't merged yet  (although
some WIP patches are available).
I think it's best to defer merging this note until we support changing
the list of protocols advertised via ALPN.