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-rw-r--r--manual/cowboy_rest.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/manual/cowboy_rest.md b/manual/cowboy_rest.md
index 4d5862a..4891d9d 100644
--- a/manual/cowboy_rest.md
+++ b/manual/cowboy_rest.md
@@ -299,7 +299,8 @@ REST callbacks description
> This value will be sent as the value of the etag header.
>
> If a binary is returned, then the value will be parsed
-> to the tuple form automatically.
+> to the tuple form automatically. The value must be in
+> the same format as the etag header, including quotes.
### is_authorized