diff --git a/api/agent/protocol/http.go b/api/agent/protocol/http.go
index a273c85c6..2291ece8d 100644
--- a/api/agent/protocol/http.go
+++ b/api/agent/protocol/http.go
@@ -41,8 +41,10 @@ func (h *HTTPProtocol) Dispatch(w io.Writer, req *http.Request) error {
 			return err
 		}
 
-		for k, v := range res.Header {
-			rw.Header().Add(k, v) // on top of any specified on the route
+		for k, vs := range res.Header {
+			for _, v := range vs {
+				rw.Header().Add(k, v) // on top of any specified on the route
+			}
 		}
 		rw.WriteHeader(res.StatusCode)
 		// TODO should we TCP_CORK ?
diff --git a/docs/writing.md b/docs/writing.md
index dbbfa362b..134ec4dcf 100644
--- a/docs/writing.md
+++ b/docs/writing.md
@@ -38,9 +38,11 @@ You will also have access to a set of environment variables.
 * `FN_CALL_ID` - a unique ID for each function execution.
 * `FN_FORMAT` - a string representing one of the [function formats](function-format.md), currently either `default` or `http`. Default is `default`. 
 * `FN_MEMORY` - a number representing the amount of memory available to the call, in MB
+* `FN_TYPE` - the type for this call, currently 'sync' or 'async'
 * `FN_HEADER_$X` - the HTTP headers that were set for this request. Replace $X with the upper cased name of the header and replace dashes in the header with underscores.
   * `$X` - any [configuration values](https://gitlab.oracledx.com/odx/functions/blob/master/fn/README.md#application-level-configuration) you've set
   for the Application or the Route. Replace X with the upper cased name of the config variable you set. Ex: `minio_secret=secret` will be exposed via MINIO_SECRET env var.
+* `FN_PARAM_$Y` - any variables found from parsing the URL. Replace $Y with any `:var` from the url.
 
 Warning: these may change before release.