diff --git a/README.md b/README.md
index ef9b015bd..6c8bbb453 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,10 @@ Para ejecutar la aplicación en local:
 bundle exec bin/rails s
 ```
 
+Prerequisitos para los tests: tener instalado PhantomJS >= 2.0 
+
 Para ejecutar los tests:
+
 ```
 bundle exec bin/rspec
 ```
diff --git a/README_EN.md b/README_EN.md
index ee63eede4..9ebc58731 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -37,7 +37,10 @@ Run the app locally:
 bundle exec bin/rails s
 ```
 
+Prerequisites for testing: install PhantomJS >= 2.0
+
 Run the tests with:
+
 ```
 bundle exec bin/rspec
 ```