diff --git a/eslint.config.mjs b/eslint.config.mjs
index 1259af2..b22749d 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -2,7 +2,7 @@
 import antfu from '@antfu/eslint-config'
 
 export default antfu().append({
-  files: ['README.md'],
+  files: ['README.md', 'SPEC.md'],
   rules: {
     'style/no-tabs': 'off',
   },