diff --git a/autogen.sh b/autogen.sh
index 30756e8..e2801d8 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -356,7 +356,7 @@ function autogenForFile() {
       printFileCommentTemplate "%"
       ;;
 
-    *.hs)
+    *.hs | *.lua)
       printLicenseNonHashComment "--"
       printFileCommentTemplate "--"
       ;;
diff --git a/tests/testdata/lua-separator.err b/tests/testdata/lua-separator.err
new file mode 100644
index 0000000..e69de29
diff --git a/tests/testdata/lua-separator.in b/tests/testdata/lua-separator.in
new file mode 100644
index 0000000..f8352cc
--- /dev/null
+++ b/tests/testdata/lua-separator.in
@@ -0,0 +1 @@
+--separator file.lua
diff --git a/tests/testdata/lua-separator.out b/tests/testdata/lua-separator.out
new file mode 100644
index 0000000..e689d1c
--- /dev/null
+++ b/tests/testdata/lua-separator.out
@@ -0,0 +1,18 @@
+-- Copyright 2014 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.
+--
+--------------------------------------------------------------------------------
+--
+-- TODO: High-level file comment.
+
diff --git a/tests/testdata/lua.err b/tests/testdata/lua.err
new file mode 100644
index 0000000..e69de29
diff --git a/tests/testdata/lua.in b/tests/testdata/lua.in
new file mode 100644
index 0000000..a5a219a
--- /dev/null
+++ b/tests/testdata/lua.in
@@ -0,0 +1 @@
+file.lua
diff --git a/tests/testdata/lua.out b/tests/testdata/lua.out
new file mode 100644
index 0000000..ed3031a
--- /dev/null
+++ b/tests/testdata/lua.out
@@ -0,0 +1,16 @@
+-- Copyright 2014 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.
+
+-- TODO: High-level file comment.
+