diff --git a/.yamllint b/.yamllint
index 41d60da6..ef433bd4 100644
--- a/.yamllint
+++ b/.yamllint
@@ -1,6 +1,8 @@
 ---
 extends: default
+
 rules:
   line-length:
     level: warning
     max: 120
+  truthy: {allowed-values: ["true", "false", "on"]}