diff --git a/index.ipynb b/index.ipynb
index 67fb056..cdb9211 100644
--- a/index.ipynb
+++ b/index.ipynb
@@ -53,7 +53,7 @@
    "source": [
     "```sh\n",
     "# make sure {{lib_path}} package is installed in development mode\n",
-    "$ pip install -e .\n",
+    "$ pip install -e .[dev]\n",
     "\n",
     "# make changes under nbs/ directory\n",
     "# ...\n",
diff --git a/settings.ini b/settings.ini
index 3a886d0..9b39abc 100644
--- a/settings.ini
+++ b/settings.ini
@@ -10,7 +10,7 @@ version = 0.0.1
 ### OPTIONAL ###
 
 # requirements = fastcore
-# dev_requirements = 
+# dev_requirements = ipykernel
 # console_scripts =
 
 ### nbdev ###