diff --git a/README.md b/README.md
index 6bbae6c..d0b7a96 100644
--- a/README.md
+++ b/README.md
@@ -6,10 +6,14 @@ Downloads USGS data for a given location and makes a pretty map of the rivers. T
 1. Clone the repository
 2. Edit the extent of the map you want to produce in `extent.csv`. Include lat/long coordinates of two opposite corners (i.e. top-left and bottom-right).
 3. Run the scripts:
-- `01_download_data.R` - This will take the longest. The whole of Wisconsin downloads ~12GB of data. It downloads the data to a `data/` directory in the repo
-- `02_process_data.R` - This loads and processes the data. After the initial run downloading the data for a given extent, you can start with this script.
-- `03_make_figures.R` - This generates figures in a `figures/` directory in the repo.
+    - `01_download_data.R` - This will take the longest. The whole of Wisconsin downloads ~12GB of data. It downloads the data to a `data/` directory in the repo
+    - `02_process_data.R` - This loads and processes the data. After the initial run downloading the data for a given extent, you can start with this script.
+    - `03_make_figures.R` - This generates figures in a `figures/` directory in the repo.
 
+## required packages/libraries installed:
+- `R`
+- `nhdplusTools`
+- `sf`
 
 ## Example figure
 ![example figure](example.png)