diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index fa5d860eb..61dd1676a 100644
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -2334,7 +2334,8 @@ struct embed_region {
 };
 
 /*
- * https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs(5)#BOOTLOADER_SUPPORT
+ * https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#man-btrfs5-bootloader-support
+ * or invoke "man 5 btrfs" and visit the "BOOTLOADER SUPPORT" subsection.
  * The first 1 MiB on each device is unused with the exception of primary
  * superblock that is on the offset 64 KiB and spans 4 KiB.
  *