diff --git a/docs/http.md b/docs/http.md
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--- a/docs/http.md
+++ b/docs/http.md
@@ -1,3 +1,8 @@
+# OSRM HTTP server
+
+Built-in HTTP server is a basic HTTP/1.0 server that supports 'keep-alive' extension. Persistent connections are limited to 512 requests per
+connection and allow no more then 5 seconds between requests.
+
 ## General options
 
 All OSRM HTTP requests use a common structure.