README.md in fluent-plugin-twitter-0.2.1 vs README.md in fluent-plugin-twitter-0.2.2

@@ -27,10 +27,10 @@
   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            sampling                # Required (sampling or userstream)
-  keyword             Ruby,Python             # Optional (only work with `timeline` is sampling)
+  keyword             Ruby,Python             # Optional (currently, only work with `timeline` is sampling)
   lang                ja,en                   # Optional
   output_format       nest                    # Optional (nest or flat or simple[default])
 </source>
 
 <match input.twitter.sampling>