diff --git a/src/remoteForWebdav.ts b/src/remoteForWebdav.ts
index b8cd0d1..d52e262 100644
--- a/src/remoteForWebdav.ts
+++ b/src/remoteForWebdav.ts
@@ -100,6 +100,7 @@ if (VALID_REQURL) {
       let r2: Response = undefined;
       if ([101, 103, 204, 205, 304].includes(r.status)) {
         // A null body status is a status that is 101, 103, 204, 205, or 304.
+        // https://fetch.spec.whatwg.org/#statuses
         // fix this: Failed to construct 'Response': Response with null body status cannot have body
         r2 = new Response(null, {
           status: r.status,