diff --git a/arrays_strings/permutation/permutation_solution.ipynb b/arrays_strings/permutation/permutation_solution.ipynb
index 1ec421c..2cca059 100644
--- a/arrays_strings/permutation/permutation_solution.ipynb
+++ b/arrays_strings/permutation/permutation_solution.ipynb
@@ -58,7 +58,8 @@
     "* One or more empty strings -> False\n",
     "* 'Nib', 'bin' -> False\n",
     "* 'act', 'cat' -> True\n",
-    "* 'a ct', 'ca t' -> True"
+    "* 'a ct', 'ca t' -> True\n",
+    "* 'dog', 'doggo' -> False"
    ]
   },
   {
@@ -200,6 +201,7 @@
     "        assert_equal(func('Nib', 'bin'), False)\n",
     "        assert_equal(func('act', 'cat'), True)\n",
     "        assert_equal(func('a ct', 'ca t'), True)\n",
+    "        assert_equal(func('dog', 'doggo'), False)\n",
     "        print('Success: test_permutation')\n",
     "\n",
     "\n",
diff --git a/arrays_strings/permutation/test_permutation_solution.py b/arrays_strings/permutation/test_permutation_solution.py
index 8320cfd..9ab124c 100644
--- a/arrays_strings/permutation/test_permutation_solution.py
+++ b/arrays_strings/permutation/test_permutation_solution.py
@@ -9,6 +9,7 @@ class TestPermutation(object):
         assert_equal(func('Nib', 'bin'), False)
         assert_equal(func('act', 'cat'), True)
         assert_equal(func('a ct', 'ca t'), True)
+        assert_equal(func('dog', 'doggo'), False)
         print('Success: test_permutation')