Dockerfile: Add basic comment

diff --git a/Dockerfile b/Dockerfile
index 01e194f4a765660daf4294d5cbd74f04116ca9d2..4e72aec8b8670209f9010d7fe25bd5095a50df0e 100644 (file)
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,5 @@
+# Basic Dockerfile to run cookstyle linting
+# run: docker build -t test .
 FROM ruby:2.6
 
 WORKDIR /app