diff --git a/README.md b/README.md
index 7c6488c1..8decebff 100644
--- a/README.md
+++ b/README.md
@@ -125,6 +125,7 @@ formatting.
 | Perl | [perl -c](https://perl.org/), [perl-critic](https://metacpan.org/pod/Perl::Critic) |
 | PHP | [hack](http://hacklang.org/), [hackfmt](https://github.com/facebook/flow/tree/master/hack/hackfmt), [langserver](https://github.com/felixfbecker/php-language-server), [phan](https://github.com/phan/phan) see `:help ale-php-phan` to instructions, [php -l](https://secure.php.net/), [phpcs](https://github.com/squizlabs/PHP_CodeSniffer), [phpmd](https://phpmd.org), [phpstan](https://github.com/phpstan/phpstan), [phpcbf](https://github.com/squizlabs/PHP_CodeSniffer) |
 | Pod | [proselint](http://proselint.com/), [write-good](https://github.com/btford/write-good) |
+| proto | [protoc-gen-lint](https://github.com/ckaznocha/protoc-gen-lint) |
 | Pug | [pug-lint](https://github.com/pugjs/pug-lint) |
 | Puppet | [puppet](https://puppet.com), [puppet-lint](https://puppet-lint.com) |
 | Python | [autopep8](https://github.com/hhatto/autopep8), [flake8](http://flake8.pycqa.org/en/latest/), [isort](https://github.com/timothycrosley/isort), [mypy](http://mypy-lang.org/), [pycodestyle](https://github.com/PyCQA/pycodestyle), [pyls](https://github.com/palantir/python-language-server), [pylint](https://www.pylint.org/) !!, [yapf](https://github.com/google/yapf) |
diff --git a/doc/ale.txt b/doc/ale.txt
index 94016623..5533277b 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -312,6 +312,7 @@ Notes:
 * Perl: `perl -c`, `perl-critic`
 * PHP: `hack`, `hackfmt`, `langserver`, `phan`, `php -l`, `phpcs`, `phpmd`, `phpstan`, `phpcbf`
 * Pod: `proselint`, `write-good`
+* proto: `protoc-gen-lint`
 * Pug: `pug-lint`
 * Puppet: `puppet`, `puppet-lint`
 * Python: `autopep8`, `flake8`, `isort`, `mypy`, `pycodestyle`, `pyls`, `pylint`!!, `yapf`