README.md in fluent-plugin-sql-2.0.0 vs README.md in fluent-plugin-sql-2.1.0

- old
+ new

@@ -25,9 +25,14 @@
 
 We recommend that mysql2 gem is higher than `0.3.12` and pg gem is higher than `0.16.0`.
 
 If you use ruby 2.1, use pg gem 0.21.0 (< 1.0.0) because ActiveRecord 5.1.4 or earlier doesn't support Ruby 2.1.
 
+### Resolve tzinfo version conflict
+
+If you want to use fluent-plugin-sql with recent fluentd/td-agent, you need to downgrade tzinfo to v1.x manually.
+See also this comment: https://github.com/fluent/fluent-plugin-sql/issues/87#issuecomment-614552292
+
 ## Input: How It Works
 
 This plugin runs following SQL periodically:
 
 SELECT * FROM *table* WHERE *update\_column* > *last\_update\_column\_value* ORDER BY *update_column* ASC LIMIT 500