diff --git a/source/notebooks/wangchanberta_getting_started_aireseach.ipynb b/source/notebooks/wangchanberta_getting_started_aireseach.ipynb
index ae01036..f0b7ebf 100644
--- a/source/notebooks/wangchanberta_getting_started_aireseach.ipynb
+++ b/source/notebooks/wangchanberta_getting_started_aireseach.ipynb
@@ -33,7 +33,7 @@
     "id": "kYYDVSgj-rs6"
    },
    "source": [
-    "# Installation"
+    "## Installation"
    ]
   },
   {
@@ -156,7 +156,7 @@
     "id": "QAVvxEO3Ihdg"
    },
    "source": [
-    "# Choose Pretrained Model"
+    "## Choose Pretrained Model"
    ]
   },
   {
@@ -274,7 +274,7 @@
     "id": "ioofbdH49Mud"
    },
    "source": [
-    "# Masked Token Prediction"
+    "## Masked Token Prediction"
    ]
   },
   {
@@ -389,7 +389,7 @@
     "id": "uuhgmkcM9StV"
    },
    "source": [
-    "# Sequence Classification"
+    "## Sequence Classification"
    ]
   },
   {
@@ -409,7 +409,7 @@
     "id": "hq8eN2xi1YCN"
    },
    "source": [
-    "## Pretrained Multi-class Classifiers - Wisesight Sentiment and Wongnai Reviews"
+    "### Pretrained Multi-class Classifiers - Wisesight Sentiment and Wongnai Reviews"
    ]
   },
   {
@@ -539,7 +539,7 @@
     "id": "_oq4vnrz9aa8"
    },
    "source": [
-    "# Token Classification"
+    "## Token Classification"
    ]
   },
   {
@@ -557,7 +557,7 @@
     "id": "r_IY0lDi1qTp"
    },
    "source": [
-    "## Pretrained Token Classifiers - ThaiNER and LST20"
+    "### Pretrained Token Classifiers - ThaiNER and LST20"
    ]
   },
   {
@@ -696,7 +696,7 @@
     "id": "xza1BTvK16rb"
    },
    "source": [
-    "# Document Vectors"
+    "## Document Vectors"
    ]
   },
   {
@@ -717,7 +717,7 @@
     "id": "dMnIv7-g2DNi"
    },
    "source": [
-    "## Feature Extraction"
+    "### Feature Extraction"
    ]
   },
   {
@@ -924,7 +924,7 @@
     "id": "-ffgI_dRZPdJ"
    },
    "source": [
-    "## Zero-shot Text Classification"
+    "### Zero-shot Text Classification"
    ]
   },
   {