diff --git a/Caches/FileDbCache/FileDbCache.cs b/Caches/FileDbCache/FileDbCache.cs
index 3133822f..f84b72e4 100644
--- a/Caches/FileDbCache/FileDbCache.cs
+++ b/Caches/FileDbCache/FileDbCache.cs
@@ -13,8 +13,7 @@ using System.Threading.Tasks;
 namespace MapControl.Caching
 {
     /// <summary>
-    /// IDistributedCache implementation based on FileDb, a free and simple No-SQL database by EzTools Software.
-    /// See http://www.eztools-software.com/tools/filedb/.
+    /// IDistributedCache implementation based on FileDb, https://github.com/eztools-software/FileDb.
     /// </summary>
     public sealed class FileDbCache : IDistributedCache, IDisposable
     {
diff --git a/Caches/SQLiteCache/SQLiteCache.cs b/Caches/SQLiteCache/SQLiteCache.cs
index dd0a37f6..aba6f30d 100644
--- a/Caches/SQLiteCache/SQLiteCache.cs
+++ b/Caches/SQLiteCache/SQLiteCache.cs
@@ -13,7 +13,7 @@ using System.Threading.Tasks;
 namespace MapControl.Caching
 {
     /// <summary>
-    /// IDistributedCache implementation based on System.Data.SQLite.
+    /// IDistributedCache implementation based on System.Data.SQLite, https://system.data.sqlite.org/.
     /// </summary>
     public sealed class SQLiteCache : IDistributedCache, IDisposable
     {