diff --git a/notebooks.json b/notebooks.json
index 043450f8c838acde111fd1722b6cc65e1f436817..3500a2af992cd8ca992460dae1f0f820dc2430a1 100644
--- a/notebooks.json
+++ b/notebooks.json
@@ -1,5 +1,5 @@
 {
-    "baseUrl": "https://github.com/lesteve/scikit-learn-tutorial/blob/master/"
+    "baseUrl": "https://github.com/lesteve/scikit-learn-tutorial/blob/master/",
     "notebooks": [
       "notebooks/01_tabular_data_exploration.ipynb",
       "notebooks/02_basic_preprocessing.ipynb",