Update README.md (#191)

diff --git a/README.md b/README.md
index c154a32..4fa9a98 100644
--- a/README.md
+++ b/README.md
@@ -96,20 +96,22 @@
 
 Install
 =======
-
+This requires you to have a distribution of Apache Spark downloaded to the system where Apache Toree will run. The following commands will install Apache Toree.
+```
+pip install --upgrade toree
+jupyter toree install --spark_home=<YOUR_SPARK_PATH>
+```
 Dev snapshots of Toree are located at https://dist.apache.org/repos/dist/dev/incubator/toree. To install using one
 of those packages, you can use the following:
-
 ```
 pip install <PIP_RELEASE_URL>
-jupyter toree install
+jupyter toree install --spark_home=<YOUR_SPARK_PATH>
 ```
-
 where `PIP_RELEASE_URL` is one of the `pip` packages. For example:
 
 ```
 pip install https://dist.apache.org/repos/dist/dev/incubator/toree/0.2.0/snapshots/dev1/toree-pip/toree-0.2.0.dev1.tar.gz
-jupyter toree install
+jupyter toree install --spark_home=<YOUR_SPARK_PATH>
 ```
 
 Reporting Issues