README.md in fluent-plugin-twitter-0.5.1 vs README.md in fluent-plugin-twitter-0.5.2

@@ -36,19 +36,21 @@
 
 ## Input Configuration
 
 ### Input Sample
 
+It require td-agent2 (fluentd v0.12) to use keyword with hashtag.
+
 `````
 <source>
   type twitter
   consumer_key        YOUR_CONSUMER_KEY       # Required
   consumer_secret     YOUR_CONSUMER_SECRET    # Required
   oauth_token         YOUR_OAUTH_TOKEN        # Required
   oauth_token_secret  YOUR_OAUTH_TOKEN_SECRET # Required
   tag                 input.twitter.sampling  # Required
   timeline            tracking                # Required (tracking or sampling or location or userstream)
-  keyword             Ruby,Python             # Optional (keyword is priority than follow_ids)
+  keyword             'Ruby,Python,#fleuntd'  # Optional (keyword has priority than follow_ids)
   follow_ids          14252,53235             # Optional (integers, not screen names)
   locations           31.110283, 129.431631, 45.619283, 145.510175  # Optional (bounding boxes; first pair specifies longitude/latitude of southwest corner)
   lang                ja,en                   # Optional
   output_format       nest                    # Optional (nest or flat or simple[default])
 </source>