diff --git a/pages/common/b2sum.md b/pages/common/b2sum.md
index fb815134bf..d0d0e3406f 100644
--- a/pages/common/b2sum.md
+++ b/pages/common/b2sum.md
@@ -1,6 +1,7 @@
 # b2sum
 
 > Calculate BLAKE2 cryptographic checksums.
+> More information: <https://blake2.net/#su>.
 
 - Calculate the BLAKE2 checksum for a file: