Update README

cff3 · Nov 7, 2015 · 3862b4f · 3862b4f
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@@ -9,6 +9,9 @@ Elasticsearch (__1.x__ or higher (2.x _highly_ recommended)) cluster accessible
 Significant effort has been invested to create a small, dependency-free, self-contained jar that can be downloaded and put to use without any dependencies. Simply make it available to your job classpath and you're set.
 For a certain library, see the dedicated [chapter](http://www.elastic.co/guide/en/elasticsearch/hadoop/current/requirements.html).
 
+ES-Hadoop 2.0.x and 2.1.x are compatible with Elasticsearch __1.X__
+ES-Hadoop 2.2.x and higher are compatible with Elasticsearch __1.X__ and __2.X__
+
 ## Installation
 
 ### Stable Release (currently `2.1.2`)