diff --git a/pages/common/join.md b/pages/common/join.md
index 3e686d1988..1c0b5d452e 100644
--- a/pages/common/join.md
+++ b/pages/common/join.md
@@ -1,6 +1,7 @@
 # join
 
 > Join lines of two sorted files on a common field.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/join-invocation.html>.
 
 - Join two files on the first (default) field: