diff --git a/README.md b/README.md
index a5060ba7545..a502d852e37 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ In order to install the plugin, simply run:
 bin/plugin -install elasticsearch/elasticsearch-analysis-icu/2.3.0
 ```
 
+You need to install a version matching your Elasticsearch version:
 
 | elasticsearch |  ICU Analysis Plugin  |   Docs     |  
 |---------------|-----------------------|------------|