diff --git a/.yamllint b/.yamllint
index 0f84b6d..087c860 100644
--- a/.yamllint
+++ b/.yamllint
@@ -15,3 +15,8 @@ rules:
   indentation:
     spaces: 2
     indent-sequences: consistent
+  truthy:
+    allowed-values:
+      - "true"
+      - "false"
+      - "on"