diff --git a/modules/services/window-managers/i3-sway/lib/functions.nix b/modules/services/window-managers/i3-sway/lib/functions.nix
index 3cb7eca5..75b3f7b6 100644
--- a/modules/services/window-managers/i3-sway/lib/functions.nix
+++ b/modules/services/window-managers/i3-sway/lib/functions.nix
@@ -4,9 +4,13 @@ with lib;
 
 rec {
   criteriaStr = criteria:
-    "[${
-      concatStringsSep " " (mapAttrsToList (k: v: ''${k}="${v}"'') criteria)
-    }]";
+    let
+      toCriteria = k: v:
+        if builtins.isBool v then
+          (if v then "${k}" else "")
+        else
+          ''${k}="${v}"'';
+    in "[${concatStringsSep " " (mapAttrsToList toCriteria criteria)}]";
 
   keybindingDefaultWorkspace = filterAttrs (n: v:
     cfg.config.defaultWorkspace != null && v == cfg.config.defaultWorkspace)
diff --git a/modules/services/window-managers/i3-sway/lib/options.nix b/modules/services/window-managers/i3-sway/lib/options.nix
index 478fc856..1dcb330e 100644
--- a/modules/services/window-managers/i3-sway/lib/options.nix
+++ b/modules/services/window-managers/i3-sway/lib/options.nix
@@ -353,14 +353,23 @@ let
 
       criteria = mkOption {
         type = criteriaModule;
-        description =
-          "Criteria of the windows on which command should be executed.";
-        example = { title = "x200: ~/work"; };
+        description = ''
+          Criteria of the windows on which command should be executed.
+          </para><para>
+          A value of <literal>true</literal> is equivalent to using an empty
+          criteria (which is different from an empty string criteria).
+        '';
+        example = literalExample ''
+          {
+            title = "x200: ~/work";
+            floating = true;
+          };
+        '';
       };
     };
   };
 
-  criteriaModule = types.attrsOf types.str;
+  criteriaModule = types.attrsOf (types.either types.str types.bool);
 in {
   fonts = mkOption {
     type = with types; either (listOf str) fontOptions;