diff --git a/09_eeg_use_case.ipynb b/09_eeg_use_case.ipynb
index 2df33335c75e7dfb504a9e070e839556e3918153..fa6fb948d23ea305cb8131ab675b9c19ef3aedb8 100644
--- a/09_eeg_use_case.ipynb
+++ b/09_eeg_use_case.ipynb
@@ -808,7 +808,11 @@
   {
    "cell_type": "code",
    "execution_count": 18,
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "solution"
+    ]
+   },
    "outputs": [
     {
      "name": "stdout",
@@ -874,7 +878,11 @@
   {
    "cell_type": "code",
    "execution_count": 19,
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "solution"
+    ]
+   },
    "outputs": [
     {
      "name": "stdout",
@@ -1012,7 +1020,11 @@
   {
    "cell_type": "code",
    "execution_count": 21,
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "solution"
+    ]
+   },
    "outputs": [
     {
      "data": {
@@ -1049,7 +1061,11 @@
   {
    "cell_type": "code",
    "execution_count": 22,
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "solution"
+    ]
+   },
    "outputs": [
     {
      "data": {