diff --git a/_posts/2023-08-17-maps.md b/_posts/2023-08-17-maps.md
index 1378ae7..45a84f1 100644
--- a/_posts/2023-08-17-maps.md
+++ b/_posts/2023-08-17-maps.md
@@ -30,7 +30,7 @@ crossorigin=""></script>
 <div id="map" style="height:90cqw; width:90cqw"></div>
 <figcaption>
 <br>
-These map tiles are from <a href="https://stamen.com/">Stamen design</a>, essentially a really nice style sheet on top of &copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributor data. The viewer is <a href="https://leafletjs.com/">leaflet.js</a>. I used CSS container queries to make this a nice square shape.
+The black and white map tiles are from <a href="https://stamen.com/">Stamen design</a>, essentially a really nice style sheet on top of &copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributor data. The rest are OS Maps from the <a href="http://maps.nls.uk/projects/subscription-api/">National Library of Scotland</a>. The viewer is <a href="https://leafletjs.com/">leaflet.js</a>. I used CSS container queries to make this a nice square shape.
 </figcaption>
 </figure>