diff --git a/nixos/modules/services/system/cachix-watch-store.nix b/nixos/modules/services/system/cachix-watch-store.nix
index ec73c0bcdcfe..85e9509bcc82 100644
--- a/nixos/modules/services/system/cachix-watch-store.nix
+++ b/nixos/modules/services/system/cachix-watch-store.nix
@@ -25,7 +25,7 @@ in
 
     compressionLevel = mkOption {
       type = types.nullOr types.int;
-      description = lib.mdDoc "The compression level for XZ compression (between 0 and 9)";
+      description = lib.mdDoc "The compression level for ZSTD compression (between 0 and 16)";
       default = null;
     };