diff --git a/sys-utils/fstrim.service.in b/sys-utils/fstrim.service.in
index 457dfcf63..d70367eea 100644
--- a/sys-utils/fstrim.service.in
+++ b/sys-utils/fstrim.service.in
@@ -1,6 +1,6 @@
 [Unit]
-Description=Discard unused blocks
+Description=Discard unused blocks on filesystems from /etc/fstab
 
 [Service]
 Type=oneshot
-ExecStart=@sbindir@/fstrim -av
+ExecStart=@sbindir@/fstrim -Av