README.md in bosh-stemcell-1.3104.0 vs README.md in bosh-stemcell-1.3112.0

@@ -156,9 +156,11 @@
       bundle exec rake stemcell:build_light[/tmp/bosh-stemcell.tgz,hvm]
     ' remote
 
 To build for specific region specify `BOSH_AWS_REGION` environment variable.
 
+NOTE: to build a stemcell for the AWS HVM virtualization type, you must build a light stemcell.
+
 ### When things go sideways
 
 If you find yourself debugging any of the above processes, here is what you need to know:
 
 1. Most of the action happens in Bash scripts, which are referred to as _stages_, and can