diff --git a/README.md b/README.md
index 7d3f4c3ed64beb06fd44e76f3a325962eb33a9cd..149627513610ca6bdaa06ff10d63d2cc5c697a9f 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ Deploy prometheus [node exporter](https://github.com/prometheus/node_exporter) u
 ## Requirements
 
 - Ansible >= 2.5 (It might work on previous versions, but we cannot guarantee it)
+- gnu-tar on Mac deployer host (`brew install gnu-tar`)
 
 ## Role Variables