diff --git a/arrays_strings/reverse_string/reverse_string_solution.ipynb b/arrays_strings/reverse_string/reverse_string_solution.ipynb
index 8f69a2b..43f3376 100644
--- a/arrays_strings/reverse_string/reverse_string_solution.ipynb
+++ b/arrays_strings/reverse_string/reverse_string_solution.ipynb
@@ -93,14 +93,14 @@
    },
    "outputs": [],
    "source": [
-    "def list_of_chars(list_chars):\n",
-    "    if list_chars is None:\n",
+    "def list_of_chars(chars):\n",
+    "    if chars is None:\n",
     "        return None\n",
-    "    string_length = len(list_chars)\n",
-    "    for i in xrange(string_length/2):\n",
-    "        list_chars[i], list_chars[string_length-1-i] = \\\n",
-    "            list_chars[string_length-1-i], list_chars[i]\n",
-    "    return list_chars"
+    "    size = len(chars)\n",
+    "    for i in xrange(size/2):\n",
+    "        chars[i], chars[size-1-i] = \\\n",
+    "            chars[size-1-i], chars[i]\n",
+    "    return chars"
    ]
   },
   {