diff --git a/README.md b/README.md
index 42a578a..7842905 100644
--- a/README.md
+++ b/README.md
@@ -115,4 +115,6 @@ The hourglass with the maximum sum (19) is:
 2 4 4
   2
 1 2 4
-```
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+```
+
+This problem was originally found on [HackerRank](https://www.hackerrank.com/challenges/2d-array/problem).
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