diff --git a/Terraform-vars.sublime-syntax b/Terraform-vars.sublime-syntax
index 95dc63a..ef7f217 100644
--- a/Terraform-vars.sublime-syntax
+++ b/Terraform-vars.sublime-syntax
@@ -22,6 +22,9 @@ extends: Terraform.sublime-syntax
 # File Extensions:
 #
 # - ".tfvars": variables definitions file
-#   https://www.terraform.io/docs/configuration/variables.html#variable-definitions-tfvars-files
+#   https://developer.hashicorp.com/terraform/language/values/variables#variable-definition-files
+# - ".tfbackend": backend configuration file
+#   https://developer.hashicorp.com/terraform/language/backend#file
 file_extensions:
   - tfvars
+  - tfbackend