diff --git a/src/MaplibreGLLayer.js b/src/MaplibreGLLayer.js
index 635a527..713a675 100644
--- a/src/MaplibreGLLayer.js
+++ b/src/MaplibreGLLayer.js
@@ -171,7 +171,7 @@ export var MaplibreGLJSLayer = Layer.extend({
     // Listen for style data error (401 Unauthorized)
     this._glMap.on('error', function (error) {
       if (error.error && error.error.status === 401) {
-        console.warn('Invalid API key. Please check your ArcGIS API key.');
+        console.warn('Invalid or expired API key. Please check that API key is not expired and has the basemaps privilege assigned.');
       }
     });