README.md in fluent-plugin-gcloud-pubsub-custom-0.3.1 vs README.md in fluent-plugin-gcloud-pubsub-custom-0.3.2

@@ -25,10 +25,16 @@
 
 ```shell
 $ gem install fluent-plugin-gcloud-pubsub-custom
 ```
 
+**Caution**
+
+This plugin doesn't work in [td-agent](http://docs.fluentd.org/articles/install-by-rpm).
+
+Please use in [Fluentd installed by gem](http://docs.fluentd.org/articles/install-by-gem).
+
 ## Configuration
 
 ### Publish messages
 
 Use `gcloud_pubsub` output plugin.
@@ -49,10 +55,10 @@
   format json
 </match>
 ```
 
 - `project` (optional)
-  - Set your GCP project
+  - Set your GCP project.
   - Running fluentd on GCP, you don't have to specify.
   - You can also use environment variable such as `GCLOUD_PROJECT`.
 - `key` (optional)
   - Set your credential file path.
   - Running fluentd on GCP, you can use scope instead of specifying this.