diff --git a/config/3x5.keymap b/config/3x5.keymap
index adc87122..a89963b3 100644
--- a/config/3x5.keymap
+++ b/config/3x5.keymap
@@ -75,6 +75,15 @@
             flavor = "balanced";
             bindings = <&mo>, <&bstab>;
         };
+
+        // Swapper for smart alt+tab
+        swapper: swapper {
+            compatible = "zmk,behavior-smart-interrupt";
+            label = "SWAPPER";
+            #binding-cells = <0>;
+            bindings = <&kt LALT>, <&kp TAB>, <&kt LALT>;
+            shared-key-positions = <21>;
+        };
     };
 
     cond_layers {
@@ -187,7 +196,7 @@
 // ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤   ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤
      &kp LCTRL     &kp LGUI      &kp LALT     &am LSHFT TAB  &kp C_VOL_DN      &kp LEFT      &kp DOWN      &kp UP        &kp RIGHT     &kp C_AL_CALC
 // ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤   ├─────────────┼─────────────┼─────────────┼─────────────┼─────────────┤
-     &none         &none         &none         &kp LS(INS)   &kp C_PP          &kp INS       &kp DEL       &kp C_PREV    &kp C_NEXT    &none
+     &none         &kp LS(TAB)   &swapper      &kp LS(INS)   &kp C_PP          &kp INS       &kp DEL       &kp C_PREV    &kp C_NEXT    &none
 // ╰─────────────┴─────────────┴─────────────┼─────────────┼─────────────┤   ├─────────────┼─────────────┼─────────────┴─────────────┴─────────────╯
 #ifdef THREE_THUMBS
                                  &kp LGUI      &kp LCTRL     &trans            &trans        &kp LSHFT     &kp RALT