diff --git a/packages/utilities/src/utilities.ts b/packages/utilities/src/utilities.ts
index 15133a72..a8f833a3 100644
--- a/packages/utilities/src/utilities.ts
+++ b/packages/utilities/src/utilities.ts
@@ -271,7 +271,7 @@ const FORBIDDEN_USERNAMES_REGEXPS = [
     // Special files
     'index', 'index\\.html', '(favicon\\.[a-z]+)', 'BingSiteAuth.xml', '(google.+\\.html)', 'robots\\.txt',
     '(sitemap\\.[a-z]+)', '(apple-touch-icon.*)', 'security-whitepaper\\.pdf', 'security\\.txt', 'llms\\.txt',
-    'llms-full\\.txt', 'AGENTS\\.md',
+    'llms-full\\.txt', 'AGENTS\\.md', 'CLAUDE\\.md',
 
     // All hidden files
     '(\\..*)',
diff --git a/test/utilities.test.ts b/test/utilities.test.ts
index 255f6590..b8ff4677 100644
--- a/test/utilities.test.ts
+++ b/test/utilities.test.ts
@@ -78,6 +78,8 @@ describe('utilities', () => {
             expect(utils.isForbiddenUsername('llms-full.txt')).toBe(true);
             expect(utils.isForbiddenUsername('AGENTS.md')).toBe(true);
             expect(utils.isForbiddenUsername('agents.MD')).toBe(true);
+            expect(utils.isForbiddenUsername('CLAUDE.md')).toBe(true);
+            expect(utils.isForbiddenUsername('claude.MD')).toBe(true);
 
             // All hidden files
             expect(utils.isForbiddenUsername('.hidden')).toBe(true);