diff --git a/docs/README.md b/docs/README.md
index ba661bb3..ca1567ff 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -5,6 +5,8 @@ The documentation HTML is produced with the Ruby-based `jekyll` tool.
 1. Make sure Ruby 2.x is installed.
 2. `gem install jekyll`
 
+> **Note**: If you are an ```Ubuntu user``` Make sure ruby2.x-dev is installed
+
 ## Viewing the documentation locally
 
 Then to view the documentation in your local checkout: