diff --git a/Tranga/MangaConnectors/MangaConnector.cs b/Tranga/MangaConnectors/MangaConnector.cs
index 21418b8..809cc3b 100644
--- a/Tranga/MangaConnectors/MangaConnector.cs
+++ b/Tranga/MangaConnectors/MangaConnector.cs
@@ -288,6 +288,7 @@ public abstract class MangaConnector : GlobalBase
     protected string SaveCoverImageToCache(string url, string mangaInternalId, RequestType requestType)
     {
         Regex urlRex = new (@"https?:\/\/((?:[a-zA-Z0-9-]+\.)+[a-zA-Z0-9]+)\/(?:.+\/)*(.+\.([a-zA-Z]+))");
+        //https?:\/\/[a-zA-Z0-9-]+\.([a-zA-Z0-9-]+\.[a-zA-Z0-9]+)\/(?:.+\/)*(.+\.([a-zA-Z]+)) for only second level domains
         Match match = urlRex.Match(url);
         string filename = $"{match.Groups[1].Value}-{mangaInternalId}.{match.Groups[3].Value}";
         string saveImagePath = Path.Join(settings.coverImageCache, filename);