Link to the reference manual from the plugin development tutorial

tutorial/plugin-development/adapter/index.md

@@ -200,8 +200,15 @@ lib/droonga/plugins/sample-logger.rb:
 (snip)
 ~~~
 
+The line beginning with `input_message.pattern` is a configuration.
+This example defines a plugin for any incoming message with `"type":"search"`.
+See the [reference manual's configuration section](../../../reference/plugin/adapter/#config)
+
 (Note: `input_message.pattern` is for Droonga 1.0.0 and later. On Droonga 0.9.9, you have to use a deprecated configuration `message.input_pattern` instead.)
 
+The method `adapt_input` is called for every incoming message matching to the pattern.
+The argument `input_message` is a wrapped version of the incoming message.
+
 Restart fluentd:
 
 ~~~
@@ -248,7 +255,9 @@ This shows the message is received by our `SampleLoggerPlugin::Adapter` and then
 
 ### Modify messages with the plugin
 
-Suppose that we want to restrict the number of records returned in the response, say `1`. What we need to do is set `limit` to be `1` for every request. Update plugin like below:
+Suppose that we want to restrict the number of records returned in the response, say `1`.
+What we need to do is set `limit` to be `1` for every request.
+Update plugin like below:
 
 lib/droonga/plugins/sample-logger.rb:
 
@@ -261,6 +270,9 @@ lib/droonga/plugins/sample-logger.rb:
 (snip)
 ~~~
 
+Like above, you can modify the incoming message via methods of the argument `input_message`.
+See the [reference manual for the message class](../../../reference/plugin/adapter/#classes-Droonga-InputMessage).
+
 Restart fluentd:
 
 ~~~
@@ -323,9 +335,10 @@ lib/droonga/plugins/sample-logger.rb:
 (snip)
     module SampleLoggerPlugin
       Plugin.registry.register("sample-logger", self)
-      (snip)
 
       class Adapter < Droonga::Adapter
+        (snip)
+
         def adapt_output(output_message)
           $log.info("SampleLoggerPlugin::Adapter", :message => output_message)
         end
@@ -334,6 +347,9 @@ lib/droonga/plugins/sample-logger.rb:
 (snip)
 ~~~
 
+The method `adapt_output` is called only for outgoing messages triggered by incoming messages processed by the plugin itself.
+See the [reference manual for plugin developers](../../../reference/plugin/adapter/) for more details.
+
 ### Run
 
 Let's restart fluentd:
@@ -398,6 +414,9 @@ lib/droonga/plugins/sample-logger.rb:
 (snip)
 ~~~
 
+Like above, you can modify the outgoing message via methods of the argument `output_message`. 
+See the [reference manual for the message class](../../../reference/plugin/adapter/#classes-Droonga-OutputMessage).
+
 Restart fluentd:
 
 ~~~
@@ -658,7 +677,7 @@ In the way just described, we can use adapter to implement the application speci
 
 ## Conclusion
 
-We have learned how to create an addon working around the adaption phase, how to receive and modify messages, both of incoming and outgoing.
+We have learned how to create an addon working around the adaption phase, how to receive and modify messages, both of incoming and outgoing. See also the [reference manual](../../../reference/plugin/adapter/) for more details.
 
 
   [basic tutorial]: ../../basic/