diff --git a/references/chart-types/custom-charts.mdx b/references/chart-types/custom-charts.mdx
index d4355ee5..f02550db 100644
--- a/references/chart-types/custom-charts.mdx
+++ b/references/chart-types/custom-charts.mdx
@@ -944,6 +944,8 @@ The config below will output a waterfall chart with the standard Vega-Lite setti
 
 ### Map charts
 
+<iframe width="100%" height="420" src="https://www.loom.com/embed/23e6301e4d494168a5946273b86c0423" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen />
+
 Map charts are perfect for visualizing data that has geographic coordinates, such as customer locations, sales regions, or shipment routes. They combine a background map (usually countries, states, or regions) with your data points overlaid as markers.
 
 This chart works best when you have **latitude and longitude fields** or a TopoJSON lookup with some ID or unique lookup name to plot the points on the map, and a numeric metric to adjust the size of each point or color gradient (like total sales or number of customers).