diff --git a/python-intro/solutions/ex12_for_loops.ipynb b/python-intro/solutions/ex12_for_loops.ipynb
index f73ec36..0a5b81f 100644
--- a/python-intro/solutions/ex12_for_loops.ipynb
+++ b/python-intro/solutions/ex12_for_loops.ipynb
@@ -217,16 +217,10 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 1,
    "id": "822b49d8-e5fe-42e9-b99b-0e67c09d18fd",
    "metadata": {
     "editable": true,
-    "execution": {
-     "iopub.execute_input": "2023-10-23T10:35:25.961126Z",
-     "iopub.status.busy": "2023-10-23T10:35:25.960684Z",
-     "iopub.status.idle": "2023-10-23T10:35:25.967160Z",
-     "shell.execute_reply": "2023-10-23T10:35:25.966241Z"
-    },
     "slideshow": {
      "slide_type": ""
     },
@@ -244,6 +238,7 @@
     }
    ],
    "source": [
+    "# This reverses the order of the string because we are going through the word a character at a time and appending each character to the start of the string - i.e. s, o+s, f+os, etc. Take a look at the value of result in each iteration of the loop.\n",
     "original = \"software carpentry\"\n",
     "result = \"\"\n",
     "for character in original:\n",
@@ -396,7 +391,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.5"
+   "version": "3.11.9"
   }
  },
  "nbformat": 4,