diff --git a/Dev-Notes.md b/Dev-Notes.md
index f24758c..0ace1e6 100644
--- a/Dev-Notes.md
+++ b/Dev-Notes.md
@@ -60,6 +60,8 @@ Other QGIS software to look into:
 - QGIS server (https://docs.qgis.org/3.28/en/docs/server_manual/index.html), a WFS/WMS server. Similar to Geoserver? Can be used in conjunction with QGIS web client
   - Includes Kubernetes instructions: https://docs.qgis.org/3.28/en/docs/server_manual/containerized_deployment.html#kubernetes
 
+Huge list of free GIS data sources: https://freegisdata.rtwilson.com/
+
 ## 20240117
 
 Example SQL query to create a `qgis_friendly` view that converts Cayenne GPS location into PostGIS point, includes unique ID, RSSI, time, and gatewayId, and filters on gatewayId: