diff --git a/linked_lists/palindrome/palindrome_challenge.ipynb b/linked_lists/palindrome/palindrome_challenge.ipynb
index 2e9e854..51a5ebd 100644
--- a/linked_lists/palindrome/palindrome_challenge.ipynb
+++ b/linked_lists/palindrome/palindrome_challenge.ipynb
@@ -34,9 +34,15 @@
    "source": [
     "## Constraints\n",
     "\n",
+    "* Can we assume this is a non-circular, singly linked list?\n",
+    "    * Yes\n",
     "* Is a single character or number a palindrome?\n",
     "    * No\n",
     "* Can we assume we already have a linked list class that can be used for this problem?\n",
+    "    * Yes\n",
+    "* Can we use additional data structures?\n",
+    "    * Yes\n",
+    "* Can we assume this fits in memory?\n",
     "    * Yes"
    ]
   },
@@ -182,21 +188,21 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.10"
+   "pygments_lexer": "ipython3",
+   "version": "3.5.0"
   }
  },
  "nbformat": 4,
diff --git a/linked_lists/palindrome/palindrome_solution.ipynb b/linked_lists/palindrome/palindrome_solution.ipynb
index a61ae82..e54c33a 100644
--- a/linked_lists/palindrome/palindrome_solution.ipynb
+++ b/linked_lists/palindrome/palindrome_solution.ipynb
@@ -33,9 +33,15 @@
    "source": [
     "## Constraints\n",
     "\n",
+    "* Can we assume this is a non-circular, singly linked list?\n",
+    "    * Yes\n",
     "* Is a single character or number a palindrome?\n",
     "    * No\n",
     "* Can we assume we already have a linked list class that can be used for this problem?\n",
+    "    * Yes\n",
+    "* Can we use additional data structures?\n",
+    "    * Yes\n",
+    "* Can we assume this fits in memory?\n",
     "    * Yes"
    ]
   },
@@ -119,10 +125,10 @@
     "\n",
     "        # Compare the reversed list with the original list\n",
     "        # Only need to compare the first half\n",
-    "        iterations_to_compare_half = length // 2\n",
+    "        iterations = length // 2\n",
     "        curr = self.head\n",
     "        curr_reversed = reversed_list.head\n",
-    "        for _ in range(0, iterations_to_compare_half):\n",
+    "        for _ in range(iterations):\n",
     "            if curr.data != curr_reversed.data:\n",
     "                return False\n",
     "            curr = curr.next\n",
@@ -229,21 +235,21 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.10"
+   "pygments_lexer": "ipython3",
+   "version": "3.5.0"
   }
  },
  "nbformat": 4,