diff --git a/README.md b/README.md
index a5cc6df9644706830caf4aee0a628cf54299e99e..0f778eddf0421b96acdeacbec997b80d0409e4aa 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ python setup.py install
 4. (optional) If you want to see Frame3dd's native output plots and animations, install gnuplot.
 On mac:
 ```
-brew install gnuplot
+brew install gnuplot --with-x11
 ```
 or on Linux
 ```