diff --git a/README.md b/README.md
index 4e9d899..5e48165 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ set  <target> <mirror>  # 换源，指定使用某镜像站
 - [ ] `chsrc set rust`  或 `chsrc set cargo` 或 `chsrc crate`
 - [ ] `chsrc set java`  或 `chsrc set maven` 或 `chsrc set mvn` 或 `chsrc gradle`
 
-- [x] `chsrc set r`  或 `chsrc set cran`  (同时会为 `bioconductor` 换源)
+- [x] `chsrc set r` 或 `chsrc set cran`  (同时会为 `bioconductor` 换源)
 - [ ] `chsrc set julia`
 
 ## 操作系统
diff --git a/chsrc.c b/chsrc.c
index 48e2b79..c2e2d65 100644
--- a/chsrc.c
+++ b/chsrc.c
@@ -104,7 +104,7 @@ double
 test_speed (const char* url)
 {
   // 我们用 —L，因为Ruby China源会跳转到其他地方
-  char* curl_cmd = xy_strjoin(4, "curl -qsL -o ", xy_os_devnull, " -w \"%{http_code} %{speed_download}\" -m8 -A chsrc/" Chsrc_Version
+  char* curl_cmd = xy_strjoin(4, "curl -qsL -o ", xy_os_devnull, " -w \"%{http_code} %{speed_download}\" -m6 -A chsrc/" Chsrc_Version
                    "  ", url);
 
   // xy_info (xy_2strjoin("chsrc: 测速 ", url));