From c022ce610e2028981aae985710a1b6132ea11ebf Mon Sep 17 00:00:00 2001
From: vcptr <51714622+vcptr@users.noreply.github.com>
Date: Sat, 19 Oct 2019 10:38:27 +0800
Subject: [PATCH] add doc under external

---
 external/README.md | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 external/README.md

diff --git a/external/README.md b/external/README.md
new file mode 100644
index 00000000..19341629
--- /dev/null
+++ b/external/README.md
@@ -0,0 +1,7 @@
+# Note
+
+The `external` dir in the project exists for historical reasons. We will migrate to use go mod to maintain 3rd party libraries.
+
+Fow now, all modules under external are used by "quic-go" to support quic protocol, and can't migrate without a breaking change.
+
+The plan is that we will remove the whole `external` dir when `quic-go` is tested to be matured enough in production.
\ No newline at end of file