diff --git a/lib/config/config_settings.h b/lib/config/config_settings.h
index 0f1e9af55..79eb14060 100644
--- a/lib/config/config_settings.h
+++ b/lib/config/config_settings.h
@@ -1328,7 +1328,8 @@ cfg(global_system_id_source_CFG, "system_id_source", global_CFG_SECTION, CFG_DEF
 	"    system ID. See 'man machine-id'.\n"
 	"  machineid\n"
 	"    Use the contents of the machine-id file to set the system ID\n"
-	"    (appmachineid is recommended.)\n"
+	"    (appmachineid is recommended to not leak the machine-id outside\n"
+	"    the machine, since it is considered private.)\n"
 	"  file\n"
 	"    Use the contents of another file (system_id_file) to set the\n"
 	"    system ID.\n"
diff --git a/man/lvmsystemid.7_main b/man/lvmsystemid.7_main
index 06e7f3454..c57296f23 100644
--- a/man/lvmsystemid.7_main
+++ b/man/lvmsystemid.7_main
@@ -197,7 +197,9 @@ See
 and
 .BR systemd-machine-id-setup (1)
 to check if machine-id is available on the host.
-(appmachineid is recommended in place of machineid.)
+(appmachineid is recommended in place of machineid in order to prevent
+the machineid from leaking outside the machine, since it is considered
+private.)
 .sp
 .I lvm.conf
 .nf