diff --git a/nixos/modules/tasks/filesystems.nix b/nixos/modules/tasks/filesystems.nix
index f98ef33046352..9afb2e45334f0 100644
--- a/nixos/modules/tasks/filesystems.nix
+++ b/nixos/modules/tasks/filesystems.nix
@@ -400,7 +400,7 @@ in
         # Filesystems.
         ${makeFstabEntries fileSystems {}}
 
-        # Swap devices.
+        ${lib.optionalString (config.swapDevices != []) "# Swap devices."}
         ${flip concatMapStrings config.swapDevices (sw:
             "${sw.realDevice} none swap ${swapOptions sw}\n"
         )}