diff --git a/README.cn.md b/README.cn.md
index dbd8f8c..ceca412 100644
--- a/README.cn.md
+++ b/README.cn.md
@@ -152,11 +152,11 @@ civitai不是每个图片都有关键词，一个模型中，也不是所有预
 
 
 ## Civitai API检查
-自从上次Civitai网站挂了之后，它对连接频率检查就好像变严格了。当它觉得扩展发送的请求频率过高，就会把扩展的API请求，跳转到Cloudflare的真人验证页面，而导致扩展无法获取任何信息。
+自从上次Civitai网站挂了之后，它对连接频率检查就好像变严格了。当它觉得扩展发送的请求不安全，就会把扩展的API请求，跳转到Cloudflare的真人验证页面，而导致扩展无法获取任何信息。
 
 这种情况，只能停止连接civitai，并耐心等待Civitai解封。可能要等好几个小时。
 
-从v1.5.1版开始，本扩展开始强制TI扫描必须每个连接后延迟1秒，以避免请求过快被当作攻击。所以，如果你是使用1.5.1或以后的版本，应该没有这个问题。
+从v1.5.1版开始，本扩展开始强制TI扫描必须每个连接后延迟1秒；并且从1.5.4开始，扩展给API请求添加了默认header，以伪装浏览器。所以，如果你是使用1.5.4或以后的版本，应该没有这个问题。
 
 
 ## 新特性
diff --git a/README.md b/README.md
index 7003f32..81d3317 100644
--- a/README.md
+++ b/README.md
@@ -151,11 +151,11 @@ In these cases, you can always link a model to civitai by filling its URL in thi
 
 
 ## Civitai API Security Check
-Since last website down of civitai, it has more strict checking for request's frequency. Once it thinks this extension is sending requests to quickly, it gonna re-direct extension's API request to Cloudflare's real human checking page. Then this extension can not get any information back. 
+Since last website down of civitai, it has more strict checking for request's frequency. Once it thinks this extension's request is not secured, it gonna re-direct extension's API request to Cloudflare's real human checking page. Then this extension can not get any information back. 
 
 In that case, you have to wait until civitai unblock you. It could take hours.  
 
-Since v1.5.1, TI scanning is forced to delay 1 second to avoid this case. So you should be find if you are using 1.5.1 or later.  
+Since v1.5.1, TI scanning is forced to delay 1 second to avoid this case. And since 1.5.4, there is a default header in all API request to fake as a browser. So you should be find if you are using 1.5.4 or later.  
 
 
 ## Feature Request
@@ -170,14 +170,10 @@ Enjoy!
 # Change Log
 ## v1.5.4
 * set sys.stdout to utf-8
-
-## v1.5.3
+* Add default header for requests to prevent from being blocked by civitai.
+* merge other v1.5.x change log to v1.5.4
 * When downloading a model by url, check if target model version is already existed in user selected sub-folder.
-
-## v1.5.2
 * Support scanning only selected model types. 
-
-## v1.5.1
 * Force TI scanning delay 1 second to prevent from civitai treating this extension's requests as attacking.
 
 ## v1.5.0