diff --git a/notebooks/noj_book/sklearn_reference.clj b/notebooks/noj_book/sklearn_reference.clj
index 2be23f6..8de232e 100644
--- a/notebooks/noj_book/sklearn_reference.clj
+++ b/notebooks/noj_book/sklearn_reference.clj
@@ -1,3 +1,5 @@
+;; # Sklearn model reference - DRAFT 🛠
+
 (ns noj-book.sklearn-reference
   (:require
    [noj-book.utils.render-tools :refer [render-key-info]]
@@ -12,7 +14,6 @@
 
 
 
-;;## Sklearn model reference - DRAFT 🛠
 
 ;;## Example: logistic regression
 
diff --git a/notebooks/noj_book/smile_classification.clj b/notebooks/noj_book/smile_classification.clj
index 47de003..07ddf98 100644
--- a/notebooks/noj_book/smile_classification.clj
+++ b/notebooks/noj_book/smile_classification.clj
@@ -1,3 +1,5 @@
+;; # Smile classification models reference - DRAFT 🛠
+
 (ns noj-book.smile-classification
   (:require
    [noj-book.utils.example-code :refer [iris-std]]
@@ -14,7 +16,6 @@
 
 
 
-;; ## Smile classification models reference - DRAFT 🛠
 
 
 (render-key-info :smile.classification)
diff --git a/notebooks/noj_book/smile_others.clj b/notebooks/noj_book/smile_others.clj
index 5ce234a..8d1f96f 100644
--- a/notebooks/noj_book/smile_others.clj
+++ b/notebooks/noj_book/smile_others.clj
@@ -1,3 +1,5 @@
+;; # Smile other models reference - DRAFT 🛠
+
 ^:kindly/hide-code
 (ns noj-book.smile-others
   (:require
@@ -6,17 +8,16 @@
    [scicloj.ml.smile.projections]
    [noj-book.utils.render-tools :refer [render-key-info]]))
 
-;; ## Smile other models reference - DRAFT 🛠
 ;; ## Smile manifolds
 
 ^:kindly/hide-code
 (render-key-info :smile.manifold)
 
-;; ### Smile/Fastmath clustering
+;; ## Smile/Fastmath clustering
 ^:kindly/hide-code
 (render-key-info :fastmath.cluster)
 
-;; ### Smile projections
+;; ## Smile projections
 ^:kindly/hide-code
 (render-key-info :smile.projections)
 
diff --git a/notebooks/noj_book/smile_regression.clj b/notebooks/noj_book/smile_regression.clj
index 1c88048..a424a4d 100644
--- a/notebooks/noj_book/smile_regression.clj
+++ b/notebooks/noj_book/smile_regression.clj
@@ -1,3 +1,5 @@
+;; # Smile regression models reference - DRAFT 🛠
+
 (ns noj-book.smile-regression 
   (:require
    [noj-book.utils.render-tools :refer [render-key-info]]
@@ -13,7 +15,6 @@
 ^:kindly/hide-code
 (require '[scicloj.ml.smile.regression])
 
-;; ## Smile regression models reference - DRAFT 🛠
 
 ^:kindly/hide-code
 (render-key-info :smile.regression)
diff --git a/notebooks/noj_book/transformer_references.clj b/notebooks/noj_book/transformer_references.clj
index 277284d..62d8b07 100644
--- a/notebooks/noj_book/transformer_references.clj
+++ b/notebooks/noj_book/transformer_references.clj
@@ -1,3 +1,5 @@
+;; # Transformer reference  - DRAFT 🛠
+
 (ns noj-book.transformer-references
   (:require
    [scicloj.kindly.v4.api :as kindly]
@@ -28,8 +30,7 @@
        (kind/md (:doc m))
        (kind/md "----------------------------------------------------------")]))))
 
-  
-;; ## Transformer reference  - DRAFT 🛠
+
 
 (docu-fn (var nlp/count-vectorize))
 
@@ -378,4 +379,4 @@ data
 ;;  able to predict well the material from the 2 PCA components.
 
 ;; It even seems, that the reduction to 2 dimensions removes
-;; too much information for predicting of the material for any type of model.
\ No newline at end of file
+;; too much information for predicting of the material for any type of model.
diff --git a/notebooks/noj_book/tribuo_reference.clj b/notebooks/noj_book/tribuo_reference.clj
index 5baeb4d..c36dbf4 100644
--- a/notebooks/noj_book/tribuo_reference.clj
+++ b/notebooks/noj_book/tribuo_reference.clj
@@ -7,13 +7,13 @@
    [noj-book.utils.tribuo-render-tools :refer [trainer-infos all-non-trainer render-configurables]]))
 
 
-;; ## Tribuo reference - DRAFT 🛠
+;; # Tribuo reference - DRAFT 🛠
 
-; ### Tribuo trainer reference 
+;; ## Tribuo trainer reference 
 ^:kindly/hide-code
 (render-configurables (trainer-infos))
 
-;; ### Tribuo component reference 
+;; ## Tribuo component reference 
 ^:kindly/hide-code
 (render-configurables  (all-non-trainer))
 
diff --git a/notebooks/noj_book/xgboost.clj b/notebooks/noj_book/xgboost.clj
index 6a78c6f..7d1804c 100644
--- a/notebooks/noj_book/xgboost.clj
+++ b/notebooks/noj_book/xgboost.clj
@@ -5,6 +5,6 @@
    [noj-book.utils.render-tools :refer [render-key-info]]))
 
 
-;; ## Xgboost model reference - DRAFT 🛠
+;; # Xgboost model reference - DRAFT 🛠
 ^:kindly/hide-code
 (render-key-info :xgboost)