diff --git a/.gitignore b/.gitignore
index 7f579d6..07efef0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@
 
 # Ignore `Gemfile.lock`
 Gemfile.lock
+
+# Docker .DS_Store
+/docker/.DS_Store
diff --git a/README.md b/README.md
index f2f0085..0b3e6d3 100644
--- a/README.md
+++ b/README.md
@@ -229,11 +229,11 @@ Bug reports and pull requests are welcome on GitHub at https://github.com/marian
 
 ## Development with Docker
 
-* Build container `docker build . -f docker/Dockerfile-2.3 -t basic_temperature_2.3`.
+* Build container: `docker build . -f docker/Dockerfile-2.3 -t basic_temperature_2.3`.
 
-* Run specs inside container `docker run -it basic_temperature_2.3:latest bundle exec rspec`.
+* Run specs inside container: `docker run -it basic_temperature_2.3:latest bundle exec rspec`.
 
-* Interactive shell inside container `docker run -it basic_temperature_2.3:latest bash`.
+* Interactive shell inside container: `docker run -it basic_temperature_2.3:latest bash`.
 
 * 2.3 can be replaced by 2.4, 2.5, 2.6 and 2.7.