diff --git a/docs/src/docs/asciidoc/index.adoc b/docs/src/docs/asciidoc/index.adoc
index 3acd37c..3bb31db 100644
--- a/docs/src/docs/asciidoc/index.adoc
+++ b/docs/src/docs/asciidoc/index.adoc
@@ -175,6 +175,8 @@ include::guides/websocket.adoc[tags=config,leveloffset=+1]
 
 = API Documentation
 
+You can browse the complete link:../../api/[Javadoc] online. The key APIs are described below:
+
 == Session
 
 A `Session` is a simplified `Map` of name value pairs.