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-rw-r--r--doc/src/guide/constraints.asciidoc5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/src/guide/constraints.asciidoc b/doc/src/guide/constraints.asciidoc
index 6cc1075..4eade8a 100644
--- a/doc/src/guide/constraints.asciidoc
+++ b/doc/src/guide/constraints.asciidoc
@@ -91,6 +91,11 @@ int(forward, Value) ->
The value must be returned even if it is not converted
by the constraint.
+The two other operations are currently experimental. They are
+meant to help implement HATEOAS type services, but proper
+support for HATEOAS is not expected to be available before
+Cowboy 3.0 because of Cowboy's current router's limitations.
+
The `reverse` operation does the opposite: it
takes a converted value and changes it back to what the
user input would have been.