diff --git a/README.md b/README.md
index a291ac2..0afefb2 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ uid           [  full  ] Xiufeng Guo <i@m.ac>
 sub   cv25519 2022-05-30 [E]
 ```
 
-Then add `m.ac` repo to `/etc/pacman.conf`:
+Then add `m.ac` repo URL `https://repo.m.ac/archlinux/$arch` to `/etc/pacman.conf`:
 
 ```sh
 sudo tee -a /etc/pacman.conf > /dev/null <<EOF