1 files changed, 2 insertions, 1 deletions

diff --git a/custom/lvm-snapshots.nix b/custom/lvm-snapshots.nix
index ede67c58..55044ca0 100644
--- a/custom/lvm-snapshots.nix
+++ b/custom/lvm-snapshots.nix
@@ -24,7 +24,8 @@ let
       
       cowSize = mkOption {
         type = types.str;
-        default = "-l20%ORIGIN";
+        default = "-l20%%ORIGIN";
+        description = "Literate argument to lvcreate, escape for systemd";
       };
 
       readOnly = mkOption {