diff --git a/arrays-strings/permutation.ipynb b/arrays-strings/permutation.ipynb
index e0dea31..cdacf65 100644
--- a/arrays-strings/permutation.ipynb
+++ b/arrays-strings/permutation.ipynb
@@ -10,7 +10,8 @@
     "* [Test Cases](#Test-Cases)\n",
     "* [Algorithm: Compare Sorted Strings](#Algorithm:-Compare-Sorted-Strings)\n",
     "* [Code: Compare Sorted Strings](#Code:-Compare-Sorted-Strings)\n",
-    "* [Pythonic-Code](#Pythonic-Code)"
+    "* [Algorithm: Hashmap Lookup](#Algorithm:-Hash-Map-Lookup)\n",
+    "* [Code: Hashmap Lookup](#Code:-Hash-Map-Lookup)"
    ]
   },
   {
@@ -114,7 +115,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Code"
+    "## Code: Hash Map Lookup"
    ]
   },
   {