diff --git a/index.d.ts b/index.d.ts
index 7244683..da0e867 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -29,6 +29,7 @@ export type Method =
   | 'post' | 'POST'
   | 'put' | 'PUT'
   | 'patch' | 'PATCH'
+  | 'purge' | 'PURGE'
   | 'link' | 'LINK'
   | 'unlink' | 'UNLINK'