Defining provider for us-east-1 - "Warning: Provider aws is undefined"

[aingham]

If I uncomment the 'provider' related lines, as my default region isn't us-east-1, then I get the following warning (when using Terraform v0.15.5):

Warning: Provider aws is undefined

[builtinnya]

Did you uncomment aws.us-east-1 definition as described in README?

# If the parent module provider region is not us-east-1, define provider for us-east-1.
#
#provider "aws" {
#  alias  = "us-east-1"
#  region = "us-east-1"
#}