diff --git a/main.go b/main.go
index f80a74f..1e4bbb7 100644
--- a/main.go
+++ b/main.go
@@ -295,7 +295,7 @@ func licenseHeader(path string, tmpl *template.Template, data licenseData) ([]by
 		lic, err = executeTemplate(tmpl, data, "/**", " * ", " */")
 	case ".cc", ".cpp", ".cs", ".go", ".hcl", ".hh", ".hpp", ".m", ".mm", ".proto", ".rs", ".swift", ".dart", ".groovy", ".v", ".sv":
 		lic, err = executeTemplate(tmpl, data, "", "// ", "")
-	case ".py", ".sh", ".yaml", ".yml", ".dockerfile", "dockerfile", ".rb", "gemfile", ".tcl", ".tf", ".bzl", ".pl", ".pp", "build":
+	case ".py", ".sh", ".yaml", ".yml", ".dockerfile", "dockerfile", ".rb", "gemfile", ".tcl", ".tf", ".bzl", ".pl", ".pp", "build", ".toml":
 		lic, err = executeTemplate(tmpl, data, "", "# ", "")
 	case ".el", ".lisp":
 		lic, err = executeTemplate(tmpl, data, "", ";; ", "")
diff --git a/testdata/expected/file.toml b/testdata/expected/file.toml
new file mode 100644
index 0000000..28eec5e
--- /dev/null
+++ b/testdata/expected/file.toml
@@ -0,0 +1,16 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[package]
+name = "not-a-real-crate"
diff --git a/testdata/initial/file.toml b/testdata/initial/file.toml
new file mode 100644
index 0000000..af1c55b
--- /dev/null
+++ b/testdata/initial/file.toml
@@ -0,0 +1,2 @@
+[package]
+name = "not-a-real-crate"