diff --git a/docs/source/howto/base_image.md b/docs/source/howto/base_image.md
index 9a77a812..6fa8f517 100644
--- a/docs/source/howto/base_image.md
+++ b/docs/source/howto/base_image.md
@@ -30,4 +30,4 @@ For example these are two scenarios that would make your repositories non-reprod
   If you change the base image in a way that is different from repo2docker's default (the Ubuntu `bionic` image), then repositories that **you** build with repo2docker may be significantly different from those that **other** instances of repo2docker build (e.g., those from [`mybinder.org`](https://mybinder.org)).
 - **Your base image changes over time.**
   If you choose a base image that changes its composition over time (e.g., an image provided by some other community), then it may cause repositories build with your base image to change in unpredictable ways.
-  We recommend choosing a base image that you know to be stable and trustworthy.
\ No newline at end of file
+  We recommend choosing a base image that you know to be stable and trustworthy.