diff --git a/pages/linux/lvextend.md b/pages/linux/lvextend.md
index 0c3c9cc051..a1eebea797 100644
--- a/pages/linux/lvextend.md
+++ b/pages/linux/lvextend.md
@@ -1,6 +1,8 @@
 # lvextend
 
 > Increase the size of a logical volume.
+> One of the Logical Volume Manager (LVM) tools.
+> More information: <https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/logical_volume_manager_administration>.
 
 - Increase a volume's size to 120GB: