diff --git a/lib/main.js b/lib/main.js
index 289b54e..6863558 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -115,7 +115,10 @@
 								}
 							}
 							else {
-								console.error("[CanvasBlocker] invalid content scripts: require not defined");
+								console.error(
+									"[CanvasBlocker] invalid content scripts: require not defined at",
+									window.location.href
+								);
 							}
 						}())`
 					}]