diff --git a/week11/prep_notebook_week11.ipynb b/week11/prep_notebook_week11.ipynb
index 7db3e91..18f33d2 100644
--- a/week11/prep_notebook_week11.ipynb
+++ b/week11/prep_notebook_week11.ipynb
@@ -2792,7 +2792,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "8d18325c",
+   "id": "1b5e77b6",
    "metadata": {},
    "source": [
     "## 6. Quick drop-down interactivity (if time)"
@@ -2801,7 +2801,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "3e2c217b",
+   "id": "ac9d3cf6",
    "metadata": {},
    "outputs": [],
    "source": []
@@ -2809,14 +2809,14 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "de34c93a",
+   "id": "9959abf5",
    "metadata": {},
    "outputs": [],
    "source": []
   },
   {
    "cell_type": "markdown",
-   "id": "b16c039f",
+   "id": "6b1c7f77",
    "metadata": {},
    "source": [
     "Final plot all together:"
@@ -2825,13 +2825,13 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "b8946029",
+   "id": "e70925d6",
    "metadata": {},
    "outputs": [],
    "source": [
     "brush = alt.selection_interval(encodings=['x','y']) # to select bins of student-teacher ratio and state\n",
     "\n",
-    "# select what is plotted in the histogram\n",
+    "# select what is plotted in the x-axis of the rectangle plot (assuming)\n",
     "input_dropdown = alt.binding_select(options=['Mobility','Population','min','max','std'], \n",
     "                                    name='Statistic')\n",
     "\n",
@@ -2861,7 +2861,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "3b866cfe",
+   "id": "cd1155bf",
    "metadata": {},
    "outputs": [],
    "source": []
@@ -2869,7 +2869,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "7b351220",
+   "id": "633d0e60",
    "metadata": {},
    "outputs": [],
    "source": []
@@ -2877,7 +2877,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "6a5ad027",
+   "id": "5f992a8d",
    "metadata": {},
    "outputs": [],
    "source": []
@@ -2885,7 +2885,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "08e5072c",
+   "id": "4cd3405d",
    "metadata": {},
    "outputs": [],
    "source": []
@@ -2893,7 +2893,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "a73889de",
+   "id": "6bb8cc60",
    "metadata": {},
    "outputs": [],
    "source": []