Docker build will not accept uppercase name

README.md

@@ -22,14 +22,14 @@ Ensure the entrypoint file is executable
 ```chmod +x docker-entrypoint.sh```
 
 ## Step four (4)
-Build a docker image (you can name it anything you want @poproar used jekyllHackNight for clarity)
+Build a docker image (you can name it anything you want @poproar used jkl for simplicity but it must be all lowercase)
 
-```docker build --force-rm -t jekyllHackNight .```
+```docker build --force-rm -t jkl .```
 
 ## Step five (5)
 Run your container (@poproar used port 4000 for his own sanity but you could use any port like 80:4000)
 
-```docker run --rm -p 4000:4000 -v $(pwd):/site jekyllHackNight```
+```docker run --rm -p 4000:4000 -v `pwd`:/site jkl```
 
 ## Step six (6)
 Point your browser to [localhost:4000](http://localhost:4000) or just [localhost](http://localhost) if you used port 80