diff --git a/arrays_strings/str_diff/str_diff_challenge.ipynb b/arrays_strings/str_diff/str_diff_challenge.ipynb
index 323fdb4..5edd688 100644
--- a/arrays_strings/str_diff/str_diff_challenge.ipynb
+++ b/arrays_strings/str_diff/str_diff_challenge.ipynb
@@ -62,7 +62,7 @@
    "source": [
     "## Algorithm\n",
     "\n",
-    "Refer to the [Solution Notebook]().  If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start."
+    "Refer to the [Solution Notebook](str_diff_solution.ipynb).  If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start."
    ]
   },
   {