1 files changed, 2 insertions, 2 deletions
diff --git a/SPEC.rdoc b/SPEC.rdoc
index 4adbe796..f4c90ab6 100644
--- a/SPEC.rdoc
+++ b/SPEC.rdoc
@@ -84,8 +84,8 @@ Rack-specific variables:
                        hijack.
 <tt>rack.protocol</tt>:: If the request is an HTTP/1 upgrade or
                          HTTP/2 CONNECT with +:protocol+ pseudo
-                         header, this is set to the value of that
-                         header.
+                         header, this is set to an +Array+
+                         containing the value(s) of that header.
 Additional environment specifications have approved to
 standardized middleware APIs. None of these are required to
 be implemented by the server.