diff --git a/README.md b/README.md
index b3d341f..cd257ba 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,15 @@
 pyiso
 ============
 
-Python client libraries for ISO and other power grid data sources.
+pyiso provides Python client libraries for ISO and other power grid data sources.
+It powers the WattTime Impact API (code https://github.com/WattTime/watttime-grid-api, live http://api.watttime.org/).
 
 Full documentation: http://pyiso.readthedocs.org/
+
+## Install
+
+```
+pip install pyiso
+```
+
+pyiso depends on [pandas](http://pandas.pydata.org/) so be prepared for a large install.