diff --git a/AOC.Common/Extensions.cs b/AOC.Common/Extensions.cs
index 5ab9f2d..a706cb3 100644
--- a/AOC.Common/Extensions.cs
+++ b/AOC.Common/Extensions.cs
@@ -13,12 +13,7 @@ public static class Extensions
     }
 
     /// <summary>
-    ///     increased accuracy for stopwatch based on frequency.
-    ///     <see
-    ///         href="http://geekswithblogs.net/BlackRabbitCoder/archive/2012/01/12/c.net-little-pitfalls-stopwatch-ticks-are-not-timespan-ticks.aspx">
-    ///         blog
-    ///         details here
-    ///     </see>
+    /// Increased accuracy for stopwatch based on frequency.
     /// </summary>
     /// <param name="stopwatch"></param>
     /// <returns></returns>