diff --git a/pixivpy3/aapi.py b/pixivpy3/aapi.py
index 39464346..2b9aa29d 100644
--- a/pixivpy3/aapi.py
+++ b/pixivpy3/aapi.py
@@ -155,11 +155,12 @@ def illust_comments(self, illust_id, offset=None, include_total_comments=None, r
         return self.parse_result(r)
 
     # 相关作品列表
-    def illust_related(self, illust_id, filter='for_ios', seed_illust_ids=None, req_auth=True):
+    def illust_related(self, illust_id, filter='for_ios', seed_illust_ids=None, offset=None, req_auth=True):
         url = '%s/v2/illust/related' % self.hosts
         params = {
             'illust_id': illust_id,
             'filter': filter,
+            'offset': offset,
         }
         if type(seed_illust_ids) == str:
             params['seed_illust_ids[]'] = [seed_illust_ids]