diff --git a/pages/linux/pstree.md b/pages/linux/pstree.md
index ad5ef346b..375cc9b49 100644
--- a/pages/linux/pstree.md
+++ b/pages/linux/pstree.md
@@ -1,6 +1,7 @@
 # pstree
 
 > A convenient tool to show running processes as a tree.
+> More information: <https://manned.org/pstree>.
 
 - Display a tree of processes: