diff --git a/README.md b/README.md
index 5354ae9..94ef091 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,11 @@ This script generates maps to analyze the potential walking routes for students
 - The actual route generation is done with OSRM, I run it locally in a docker container.
 - The basemap is pulled from Stadia Maps. The usage of the script is well within the free tier, you'll need an API key from them.
 
+## Data sources
+School location data is from: https://data-wi-dpi.opendata.arcgis.com/
+Madison Bike Level of Traffic Stress is from: https://data-cityofmadison.opendata.arcgis.com/datasets/cityofmadison::bike-lts/explore
+Student addresses provided by school.
+
 ## Example figures
 This script will generate a few figures:
 ### A heatmap of student addresses: