Fix.

src/hacker-rank/CountTheIslands.cs

@@ -13,6 +13,8 @@ namespace CodingInterview.HackerRank
 	/// {1, 0, 0, 1, 1},
 	/// {0, 0, 0, 0, 0},
 	/// {1, 0, 1, 0, 1}
+	///
+	/// https://www.hackerrank.com/contests/crescent-practice-3rd-years/challenges/islands-1
 	/// </summary>
 	public class CountTheIslands
 	{