diff --git a/pages/common/df.md b/pages/common/df.md
index 3fe03e994..dba0d071d 100644
--- a/pages/common/df.md
+++ b/pages/common/df.md
@@ -1,7 +1,7 @@
 # df
 
 > Display an overview of the filesystem disk space usage.
-> More information: <https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/df.html>.
+> More information: <https://manned.org/df.1posix>.
 
 - Display all filesystems and their disk usage using 512-byte units: