diff --git a/plugin-helper-overview/api-plugin-helper-http_server.md b/plugin-helper-overview/api-plugin-helper-http_server.md
index a96bf8f2..3de36bff 100644
--- a/plugin-helper-overview/api-plugin-helper-http_server.md
+++ b/plugin-helper-overview/api-plugin-helper-http_server.md
@@ -95,6 +95,7 @@ Request supports these following methods:
 * `query`: returns query which is `query_string` parsed by `CGI.parse`
 * `body`: returns the request body
 * `path`: returns the request path
+* `headers`: returns `Protocol::HTTP::Headers` object to read the request headers (since v1.19.0)
 
 #### Response