diff --git a/Rules.md b/Rules.md
index f2f7665d..3101cf06 100644
--- a/Rules.md
+++ b/Rules.md
@@ -2031,7 +2031,7 @@ Prefer `== false` over `!` prefix negation.
 
 ## preferFinalClasses
 
-Prefer defining `final` classes. To suppress this rule, add "Base" to the class name, add a doc comment with mentioning "base class" or "subclass", make the class `open`, or use a `// swiftformat:disable:next preferFinalClasses` directive.
+Prefer defining `final` classes. To suppress this rule, add "Base" to the class name, add a doc comment mentioning "base class" or "subclass", make the class `open`, or use a `// swiftformat:disable:next preferFinalClasses` directive.
 
 <details>
 <summary>Examples</summary>
diff --git a/Sources/Rules/PreferFinalClasses.swift b/Sources/Rules/PreferFinalClasses.swift
index 8f7f51f4..45495d44 100644
--- a/Sources/Rules/PreferFinalClasses.swift
+++ b/Sources/Rules/PreferFinalClasses.swift
@@ -13,7 +13,7 @@ public extension FormatRule {
     static let preferFinalClasses = FormatRule(
         help: """
         Prefer defining `final` classes. To suppress this rule, add "Base" to the class name, \
-        add a doc comment with mentioning "base class" or "subclass", make the class `open`, \
+        add a doc comment mentioning "base class" or "subclass", make the class `open`, \
         or use a `// swiftformat:disable:next preferFinalClasses` directive.
         """,
         disabledByDefault: true