diff --git a/api/rest/rest.go b/api/rest/rest.go
index cd5dfa7..da1337c 100644
--- a/api/rest/rest.go
+++ b/api/rest/rest.go
@@ -35,6 +35,7 @@ import (
 var (
 	log = logger.Log()
 	userAgent = "Graylog Collector v" + common.CollectorVersion
+	customRequestHeader = "sidecar"
 )
 
 const (
@@ -130,6 +131,7 @@ func (c *Client) NewRequest(method, urlStr string, params map[string]string, bod
 	req.Header.Add("Accept", mediaType)
 	req.Header.Add("User-Agent", userAgent)
 	req.Header.Add("X-Graylog-Collector-Version", common.CollectorVersion)
+	req.Header.Add("X-Requested-By", customRequestHeader)
 	return req, nil
 }