diff --git a/help/_posts/2017-01-17-CRAN.md b/help/_posts/2017-01-17-CRAN.md
index 04a6e7c..07195fc 100644
--- a/help/_posts/2017-01-17-CRAN.md
+++ b/help/_posts/2017-01-17-CRAN.md
@@ -20,7 +20,7 @@ options("repos" = c(CRAN="https://{{ site.hostname }}/CRAN/"))
 
 Ubuntu 下添加CRAN镜像安装r
 ====================================
-参考[(README里的步骤)](https://{{ site.hostname }}/CRAN/bin/linux/ubuntu/README.html)
+参考[(README里的步骤)](https://{{ site.hostname }}/CRAN/bin/linux/ubuntu/fullREADME.html)
 
 例如 `Ubuntu 18.04` 编辑  `sudo vim /etc/apt/sources.list.d/r-tuna.list` 输入
 `deb https://{{ site.hostname }}/CRAN/bin/linux/ubuntu bionic-cran40/`  (注意根据你的发行版替换`bionic`，根据需要的版本号替换`cran40`)