diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 69165a92f..1879cd837 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -124,10 +124,15 @@ possible. For example:
 
 The Fluent Bit maintainers use the [Vale](https://vale.sh/docs/) plugin, which lints
 pull requests and adds suggestions to improve style and clarity. Most Vale tests are
-at the `suggestion` level and will not block merging.
-
-The following tests are at a `warning` level and will prevent merging:
-
-- NonStandardQuotes: Use standard quotes. Google docs use curly quotes. Copy and
-  pasting from Google docs requires correcting the quotes. You can
-  [turn off smart quotes](https://support.google.com/docs/thread/217182974/can-i-turn-smart-quotes-off-in-a-google-doc?hl=en).
+at the `suggestion` level and won't block merging.
+
+The following tests are at a `error` level and will prevent merging:
+
+- [NonStandardQuotes](https://github.com/fluent/fluent-bit-docs/blob/master/vale-styles/FluentBit/NonStandardQuotes.yml):
+  [Use standard quotes](https://developers.google.com/style/quotation-marks#straight-and-curly-quotation-marks).
+  By default, Google Docs and Microsoft Word turn standard straight quotes into "smart"
+  curly quotes. If you copy-paste from one of these tools, you must correct the quotes 
+  back to straight quotes. You can also turn off smart quotes 
+  in [Google Docs](https://support.google.com/docs/thread/217182974/can-i-turn-smart-quotes-off-in-a-google-doc?hl=en) 
+  or [Microsoft Word](https://support.microsoft.com/en-us/office/smart-quotes-in-word-and-powerpoint-702fc92e-b723-4e3d-b2cc-71dedaf2f343)
+  to prevent this problem.