diff --git a/doc/.vale.ini b/doc/.vale.ini
index a241b5df..5e663902 100644
--- a/doc/.vale.ini
+++ b/doc/.vale.ini
@@ -5,7 +5,7 @@
 StylesPath = "styles"
 
 # The options are `suggestion`, `warning`, or `error` (defaults to “warning”).
-MinAlertLevel = warning
+MinAlertLevel = error
 
 # By default, `code` and `tt` are ignored.
 IgnoredScopes = code, tt