diff --git a/.yamllint b/.yamllint
new file mode 100644
index 0000000..6f0d12b
--- /dev/null
+++ b/.yamllint
@@ -0,0 +1,14 @@
+---
+extends: default
+
+ignore: |
+  .tox
+
+rules:
+  braces:
+    max-spaces-inside: 1
+    level: error
+  brackets:
+    max-spaces-inside: 1
+    level: error
+  line-length: disable
diff --git a/test-requirements.txt b/test-requirements.txt
index 4e92b9d..dfdd4f8 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,2 +1,3 @@
 black
 flake8
+yamllint
diff --git a/tox.ini b/tox.ini
index 2a510d8..ee0591c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,26 +1,27 @@
 [tox]
 minversion = 1.4.2
 envlist = linters
 skipsdist = True
 
 [testenv]
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
 [testenv:linters]
 install_command = pip install {opts} {packages}
 commands =
   black -v -l79 --check {toxinidir}
   flake8 {posargs}
+  yamllint -s .
 
 [testenv:venv]
 commands = {posargs}
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 
 show-source = True
 ignore = E123,E125,E402,W503
 max-line-length = 160
 builtins = _
 exclude = .git,.tox