diff --git a/layers/light_pollution.js b/layers/light_pollution.js
index 21a5a3d..5f9b91e 100644
--- a/layers/light_pollution.js
+++ b/layers/light_pollution.js
@@ -25,4 +25,5 @@ let layers = [];
 export default {
     name: "Light Pollution",
     layers: layers,
+    details: "For legend and more information, see <a href='https://www.cleardarksky.com/'>cleardarksky.com</a>.",
 };
diff --git a/main.js b/main.js
index b44d4d9..d333838 100644
--- a/main.js
+++ b/main.js
@@ -28,6 +28,7 @@ for (let category of layerCategories) {
   catDiv.innerHTML = `
     <details ${category.layers.filter(l => l.enabled).length > 0 ? "open" : ""}>
     <summary>${category.name}</summary>
+    ${category.details ? "<p>" + category.details + "</p>" : ""}
     <ul></ul>
     </details>
   `;