diff --git a/.gitignore b/.gitignore
index bfaf7ec..e144559 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 _site
 *.html
 *.Rproj
+.DS_Store
\ No newline at end of file
diff --git a/languages/_posts/2020-12-15-jupyter.md b/languages/_posts/2020-12-15-jupyter.md
index 6c3dd0f..6e9f915 100644
--- a/languages/_posts/2020-12-15-jupyter.md
+++ b/languages/_posts/2020-12-15-jupyter.md
@@ -33,6 +33,7 @@ jupytext --set-formats ipynb,py foo.ipynb
 ## Starting a new notebook (manually)
 
 ```shell
+# conda install -c conda-forge notebook
 jupyter notebook
 # then click new, etc
 ```