diff --git a/examples/formatter-terraform.toml b/examples/formatter-terraform.toml
index ac94312..896cb0e 100644
--- a/examples/formatter-terraform.toml
+++ b/examples/formatter-terraform.toml
@@ -2,5 +2,5 @@
 [formatter.terraform]
 command = "tofu"
 excludes = []
-includes = ["*.tf"]
+includes = ["*.tf", "*.tfvars", "*.tftest.hcl"]
 options = ["fmt"]
diff --git a/programs/terraform.nix b/programs/terraform.nix
index 6b95b5c..dddf97a 100644
--- a/programs/terraform.nix
+++ b/programs/terraform.nix
@@ -15,7 +15,12 @@ in
     settings.formatter.terraform = {
       command = cfg.package;
       options = [ "fmt" ];
-      includes = [ "*.tf" ];
+      # All opentofu-supported files
+      includes = [
+        "*.tf"
+        "*.tfvars"
+        "*.tftest.hcl"
+      ];
     };
   };
 }