diff --git a/vpc-transit-gateway-association/README.md b/vpc-transit-gateway-association/README.md
index 9856fa5..4573e91 100644
--- a/vpc-transit-gateway-association/README.md
+++ b/vpc-transit-gateway-association/README.md
@@ -20,7 +20,7 @@ you'll ned to change that to `version = ">= 4.0"`.
 
 # Setup Checklist
 
-- [ ] convert VPC to tf 1.x
+- [ ] convert VPC to tf 1.x [docs](https://github.e.it.census.gov/terraform/support/blob/master/docs/how-to/terraform-upgrade/upgrade-state.md)
 - [ ] change provider pinning in `versions.tf`
 - [ ] have access to network account via standard profile
 - [ ] ensure `tgw_environment` is defined on `module.vpc`