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-rw-r--r--guide/handlers.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/guide/handlers.md b/guide/handlers.md
index e2c1264..5ffe401 100644
--- a/guide/handlers.md
+++ b/guide/handlers.md
@@ -41,7 +41,8 @@ Custom protocol upgrades
------------------------
The `my_protocol` module above will be used for further processing
-of the request. It requires only one callback, `upgrade/4`.
+of the request. It should use the `cowboy_sub_protocol` behaviour,
+which requires only one callback, `upgrade/4`.
It receives the request object, the middleware environment, and
the handler this request has been routed to along with its options.